A stone is released from rest from the top of a high building
PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A 2kg stone is released from rest from the top of a 20m high building. Take g=9.8m/s2.
(a) Calculate the total mechanical energy of the stone at the instant of release, taking the ground as the reference level.
(b) Find the speed of the stone when it has fallen 10m.
(c) Determine its kinetic energy and potential energy at this 10m mark. Show that the total mechanical energy is equal to the value obtained in part (a).