To solve this problem, we need to calculate each of the vector components of the velocity. Our plan is to find the time it takes for the ball to horizontally reach the goal post. Once we have that time, we can apply that time to the vertical component to see at what height the ball is at this point. We know that velocity is equal to distance divided by time, and that horizontal velocity, , will not change because there is no acceleration in the horizontal direction. We will need to find the total distance that the ball travels in order to solve.

Use this distance and the given time to find the horizontal velocity.

Now let's find the initial vertical velocity,. Because we are assuming that there is nothing except for gravity influencing the ball, we can say that the ball spends half of the time reaching the peak of its trajectory, where the vertical velocity will momentarily be zero. With that information, we can solve for the initial vertical velocity:

We use only half the given time because we are only taking the time from when the ball is kicked to when it reaches the top of its trajectory (which will be half of its flight). As we stated above, velocity will be zero at the top of the trajectory. We are using a negative value for the acceleration due to gravity because gravity points downward, which in this case is the negative direction. Use the given values to solve for the initial vertical velocity.

Now that we have our velocities, let's see how long it takes for the ball to reach the goal post. We will use  as that time.

Now that we have our time, let's use a different equation to see how high the ball is at that time. We know the time, initial vertical velocity, and acceleration. Use these to find the final vertical distance, or height.

This gives us the height of the ball when it is just over the goal post. We know from the question that there is a gap of between the ball and the height of the goal post. To find that height, we take the ball's height at this moment and subtract the height of the gap.

First we need to know how long this chase takes. The dog doesn't help us there, but we know that the car is going along at a constant velocity and will therefore cover the same distance in the same amount of time.

Since the velocity is constant, we can say .

Plug in our given values.

Plug that into our equation for the dog. We can use the full distance equation for this: 

Remember the dog starts at rest.

Plug in our given information.

To solve this problem we will need to use the appropriate kinematics equation:

Remember that when an object is thrown vertically, it will have a velocity of zero at the highest point. We can use this as our final velocity. The initial velocity is given, and the acceleration will be the acceleration due to gravity. Using these values, we can solve for the displacement when the ball is at its peak.

Since there is only one force acting upon the object, the force due to friction, we can find its value using the equation . The problem gives us the mass of the crate, but we have to solve for the acceleration.

Start by finding the initial velocity. The problem gives us distance, final velocity, and change in time. We can use these values in the equation below to solve for the initial velocity.

Plug in our given values and solve.

We can use a linear motion equation to solve for the acceleration, using the velocity we just found. We now have the distance, time, and initial velocity.

Plug in the given values to solve for acceleration.

Now that we have the acceleration and the mass, we can solve for the force of friction.

The important thing to recognize here is that the amount of time the egg is falling will be equal to the amount of time the girl is running.

Our first step will be to find the time that the egg is in the air.

We know it starts from rest  above the ground, and we know the gravitational acceleration. Its total displacement will be , since it falls in the downward direction. We can use the appropriate motion equation to solve for the time:

Use the given values in the formula to solve for the time.

Now that we have the time, we can use it to find the speed of the girl. Her speed will be determined by the distance she travels in this amount of time.

Use our values for her distance and the time to solve for her velocity.

The problem gives us initial velocity, time, and a final velocity (zero as it comes to rest). The formula for acceleration is:

We are given the initial and final velocities and the time. Using these values, we can solve for the acceleration. We should expect it to be negative, since the crate is slowing down.

We are given the initial velocity of the apple (zero because it starts from rest), the acceleration (gravity), and the distance traveled. Using these values and the right motion equation, we can solve for the time that the apple is in the air.

The best equation to solve this problem will be:

Keep in mind that the change in distance is the displacement, a vector. Since the apple is traveling downward, the displacement will be negative.

Using our known values, we can solve for the time.

The formula relating velocity and acceleration is:

We are given values for the acceleration and time. We can also conclude that the initial velocity is zero. Using these values, we can solve for the final velocity.

To solve this problem manipulate the motion equation  to solve for time. Note that since the cannon has no initial velocity in the y-direction, the initial velocity term disappears from the equation. Use .

We can solve this question using the given initial velocity, final velocity, and time.