Question

A boy throws a stone upward with the velocity of 60m/sec.
(a) How long will it take to reach the maximum height ( g = -10 m/sec^2) . (b) What is the maximum reach by the stone . (c) How long will it take to reach the ground.

Answer 1

(a)T=u/g=6sec
(b)H=$u^2/2g$=180m
(c)It takes same time to reach maximum height and to reach ground from that height so it takes 12 sec to reach ground after the boy thrown it.