Question

A 15 kg rock drops a distance of 21.0 m
to the ground. If 45 percent of the initial
potential energy goes into increasing the
internal energy of the rock, what is the
magnitude of that increase?​

Answer 1

Answer:

A drawn arrow has 50 J of stored energy due to the stretch of the bow and string. When released, this energy is converted into kinetic energy such that the arrow will have 50 J of kinetic energy upon being fired. Of course, this assumes no energy is lost to air resistance, friction or any other non-conservative forces and that the arrow is shot horizontally.