Q.4 A small iron ball of mass 5 kg falls, from rest, from the top of a building and strikes the ground 4 seconds later.
(a) How high is the building?
(b) What is its velocity on striking the ground? (c) Calculate its kinetic energy (KE) and potential energy (PE)
(i) At the start.
(ii) When half-way down.
(iii) Just before impact with ground.
[5 Marks] [5 Marks] [12 Marks]
