Question

Part A

A cart on an air track is moving at 0.5m/s when the air is suddenly turned off. The cart comes to rest in 1m. The experiment is repeated with the cart moving at 1 m/s when the air is turned off. How far does the cart travel before coming to rest?

a) 1 m

b) 2 m

c) 3 m

d) 4 m

Part B

A 4 kg mass with a speed of 2m/s and a 2kg mass with a speed of 4m/s are gliding over a horizontal frictionless surface. Both objects encounter the same horizontal force, which opposes their motion, and are brought to rest. Which statement best describes their stopping distance?

a) the 4 kg mass travels twice as far as the 2 kg mass before stopping.

b) the 2 kg mass travels twice as far as the 4 kg mass before stopping.

c) both masses have the same stopping distance.

d) the 2 kg mass travels farther, but not necessarily twice as far.