Question

A balloon starts from rest, moves vertically upwards with an acceleration g/8ms^ −2 . A stone falls from the balloon after 8 s from the start. The time taken by the stone to reach the ground is (g=9.8 ms ^−2) ____.

Answer 1

Explanation:

For balloon, distance traveled by it in 8 sec,

s=ut+21gt2 where u=0

s=21×8gt2=4g

So, time taken by stone,

s=ut+21gt2

4g=21gt2 at this height the velocity of stone will be zero

t2=8⇒t=22 s.