When you use a slingshot to fire a 500 g rock you stretch the rubber band storing potential energy. The initial elastic potential energy of the rubber band is 85 J and the rock leaves the slingshot with a speed of 18 m/s. Find how much energy is lost to heat.

Answer 1

stored energy - K.E. of rock

85 J - [.5 * 0.5 kg * (18 m/s)^2]