A 40 kg child is on a swing. When the child is 1.5 m above the ground, she is moving at 2m/s. What is the child's potential energy?

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.

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.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of