Question

a ballon starts from rest,moves vertically upwards with an acceleration g/8m/s,a stone falls from the balloon after 8sfrom the start.T is the time taken by the stone to reach the ground is

Answer 1

u=0
a=-8m/s
t=?
so to find time =
s=ut+1/2at*t
s=0*t+1/2*8*t*t
s=0+4*t*t
s=4t*t