Three rocks are rolling down a hill at the same speed. rock 1 has a mass of 1 kg, rock 2 has a mass of 1.5 kg, and rock 3 has a mass of 3 kg. which rock has the most kinetic energy?

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?