Apitcher in a professional baseball game throws a fastball, giving the baseball a momentum of 5.83 kg. given that the baseball has a mass of 0.145 kg, what is the speed?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

An athlete is holding 24 lb of weights at a height of 6 inches above the stack as shown. to lower the weights, she applies a constant force of 5 lb to the handle. determine the velocity of the weights immediately before they hit the stack.

In which of the following is positive work done by a person on a suitcase