Question

A stone thrown vertically upwards from the top of a building takes 3s to reach its maximum height . Find
1. The velocity with which it is thrown
2.the maximum height it reaches above the builibg

Answer 1

v = Vi - 9.81 t
0 = Vi - 9.81*3
so Vi = 29.4 m/s

m g h = (1/2) m v^2
so
v^2 = 2(9.81) h
29.4^2 = 19.6 h
h = 44.2 m

Answer 2

Calculate the time taken for stone a to reach it's maximum height