Determine the quantity of work done when a crane lifts a 100-n and block from 2 m above the ground to a 6 m above the ground

Which of the following represents a virtual image?

In what direction does the medium move relative to the direction of the wave? explain.

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.