A sailboat is traversing a moving river, as shown in the image. The wind pushing the sailboat has a velocity of 6 m/s. However, the sailboat is traveling at 12 m/s. Which of the following describes what causes the sailboat’s velocity?

• The water is pushing the boat 8 m/s downstream.
• The water is pushing the boat 20 m/s upstream.
• The water is pushing the boat 6 m/s against the wind.
• The water is pushing the boat 10 m/s downstream.

Two students drop identical balls from the same height. Student A drops the ball from rest while Student B rolls it off of a desk of the same height. Student A claims the ball that is dropped from rest will hit the ground first because it travels less distance. Student B claims the ball that is rolled will hit the ground first because it travels down faster. Is either student correct? Explain your reasoning.

• Neither are correct
• Student A is correct
• Student B is correct
• Both are correct

Two students drop identical balls from the same height. Student A drops the ball from rest while Student B rolls it off of a desk of the same height. Student A claims the ball that is dropped from rest will hit the ground first because it travels less distance. Student B claims the ball that is rolled will hit the ground first because it travels down faster. Which statement is correct?

• The balls fall the same y−direction (vertical) distance since they fell the same height.
• The balls fall the same x−direction (vertical) distance since they fell the same height.
• The balls fall the same y−direction (vertical) distance since they fell the different height.

Two students drop identical balls from the same height. Student A drops the ball from rest while Student B rolls it off of a desk of the same height. Student A claims the ball that is dropped from rest will hit the ground first because it travels less distance. Student B claims the ball that is rolled will hit the ground first because it travels down faster. Which statement is correct?

• The balls have the same y−direction (vertical) final velocity since they fell at the same rate.
• The balls have a different y−direction (vertical) final velocity since they fell at the same rate.
• The balls have the same y−direction (vertical) final velocity since they fell at a different rate.

A ball is kicked at an angle. The ball follows a trajectory then lands 10 m away. Which of the following graphs could not be correct based on this scenario?

• 
• 
• 
• 

A student in track and field is running a hurdles race. The hurdles are 91.4 cm tall. The student is running with a horizontal velocity of 4.00 m/s and leaps with a vertical velocity of 9.00 m/s. If the student makes this leap 0.400 m before the hurdle, will they clear the hurdle? If they clear the hurdle, how much do they clear the hurdle by? If they do not clear the hurdle, what could they do to have a higher jump?

A box is dropped out of a moving airplane. The airplane is traveling at 50 m/s East. The box is dropped from rest with respect to the airplane. The box travels a vertical distance of 40 m before landing on a trampoline. The airplane continues traveling at a constant speed after the box is dropped and the wind resistance on the falling box is negligible. Choose the option that correctly identifies the missing terms, in order of their appearance in the sentences. The box has an initial horizontal velocity of ___________ m/s. The box takes ___________ seconds to reach the ground. The box experiences an acceleration of___________ m/s2. The box will land directly ___________ the airplane.

• 0; 4.1; 9.8; behind
• 50; 1.4; −9.8; below
• −9.8; 2.0; 0; in front of
• 50; 2.9; −9.8; behind

Compare the acceleration of the Nardò Ring and the Indy 500 track. Assume cars travel clockwise around both tracks. Which of the following correctly describes the direction of the acceleration a car will experience at the labeled locations in order from A to D?

• down; left; up−right; right
• down; up; up−right; left
• left; up; down−right; right
• down−left; left; down−right; left

Based on the shape of the track, predict why do cars experience centripetal acceleration?

• The cars experience centripetal acceleration since the velocity changes direction.
• The cars experience centripetal acceleration since the velocity changes speed.
• The cars experience centripetal acceleration since the direction changes velocity.

Based on the shape of the track, predict why cars closer to the center of a curve experience a greater acceleration than cars on the outside of a curve.

• The cars on the inside because they have a smaller radius
• The cars on the outside because they have a smaller radius
• The cars on the inside because they have a larger radius
• The cars on the outside because they have a larger radius