His eyes are 1.82 m above the floor, and the top of his head is 0.16 m higher. Find the height above the floor of the top and bottom of the smallest mirror in which he can see both the top of his head and his feet.

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

What kind of simple machine is a catapult?

How is the ideal mechanical advantage of a wheel and axle calculated?