A boy drops a stone from a cliff, which reaches the ground in 20 seconds. Calculate the height of the cliff.

You pull down on a rope to raise a flag on a flag pole which describes why the rope and the flag pole act as a machine A-they change the direction of the forces B-they increase the distance over which the force acts C - they decrease the distance

A car traveling at 28 m/s starts to decelerate steadily. It comes to a complete stop in 13 seconds. What is its acceleration?

Which property of metals is Luis most likely going to demonstrate using these materials?

When water changes to ice, does the link up of atoms change?

What is the mass of an object that has a 250 N force moving at an acceleration of 10 m/s2?

Two objects have the same momentum. Do the velocities of these objects necessarily have (a) the same directions and (b) the same magnitudes? Give your reasoning in each case.

If you keep voltage constant and increase resistance resistance, what happens to current?

A scene in a movie has a stuntman falling through a floor onto a bed in the room below. The plan is to have the actor fall on his back, but a researcher has been hired to investigate the safety of this stunt.

During energy transformation, all energy systems: are a. 100 percent efficient b. lose energy c. gain heat energy d. create energy

An apple with a mass of 0.95 kilograms hangs from 3.0 meters above the ground. What is the potential energy of the apple