Question

A catapult is used to project a stone of mass 15g vertically upwards. The rubber used in the catapult has a constant force of 30NM–1. If the rubber is stretched by a force of 30N, calculate the velocity at which the stone was projected

Answer 1

PE = 1/2 kx^2 = 1/2 mv^2
you have m,k,x, so find v.

Answer 2

So difficult