1.A penalty shot requires a hockey player to hit a stationary 0.185 kg puck at the goal. Find the puck's new velocity if the 2.05 kg hockey stick approaches the puck with a velocity of 7.48 m/s and slows to only 3.97 m/s after the shot.

a.36.4 m/s

b.3.97 m/s

c. 116 m/s

d. 40.0 m/s

2.A medicine ball is thrown into a friction sled initially at rest. The sled and medicine oval then move together at 4.0 m/s. If the sled is twice as heavy as the medicine ball, how fast was the medicine ball initially thrown.

a. 8 m/s

b. 4 m/s

c. 0.25 m/s

d. 12 m/s

e 0.13 m/s

3. A 19 kg cart moving 6 m/s to the right is pushed with a variable new force F represented by the equation.

F=100-5t where F is in the newtons and t is in the second. consider right as a positive direction. If the cart is pushed for 10 seconds, how fast is it now traveling. Round to one decimal place.