A weight - lifter lifts a bell weighing(2 000 N) and holds it in the air for (5 seconds. Has he done any work? Explain your answer. ​

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.

Debris produced by mining is called

Aball of mass 0.3kg is released from rest at a height of 8m.how fast is it going when it hits the ground? accleration due to gravity is g=9.8m/s