Two spherical metal balls, A of mass 0.5kg and B of mass 5kg, are held side by side at the edge of a 30m high terrace and released together. Neglect air resistance throughout and take g=10m/s2. Answer the following:
(a) Define the term "free fall".
(b) State whether the mass of a body affects the value of acceleration due to gravity. Give a brief reason for your answer.
(c) Calculate (i) the time taken by each ball to reach the ground, and (ii) the common velocity with which they strike the ground.