Boris pushes a 5 lb. box 6 feet in 2 seconds. He has . done 50 ft-lbs. of work
a power output of 30 ft-lbs./sec
a power output of 15 ft-lbs./sec
not done work

Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?