A stone is projected horizontally from the top of a cliff with a speed of
PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A stone is projected horizontally from the top of a cliff with a speed of 15ms−1. Just as it leaves the cliff edge, its kinetic energy is 1.2kcal. (Use 1cal=4.186J.)
(i) Convert the given kinetic energy to joules.
(ii) Determine the mass of the stone.
(iii) If another stone of half this mass were projected with the same speed, what would be its kinetic energy? Express your answer in kilojoules.