Please mark these true or false

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

What was the first instrument to ever record an earthquake?

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.