Question

a balloon starts moving from rest with an upward acceleration 2 metre per second square just after 1 second a stone is dropped from at the time taken by stone to strike the ground is nearly

Answer 1

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for balloon,

initial velocity of balloon=0  so,u=o

                                                 a=2m/s2

                                                  t=1s

v=u+at                

v=2m/s  (as u=0m/s ,a=2m/s2,t=1s)

s=ut+1/2at2      

s=1m     (as u=0m/s ,a=2m/s2,t=1s)

for stone,

u=-2m/s ,s=1m,a=9.8m/s2

at2+2ut-2s=0

9.8t2-4t-2=0

t=.7s