Question

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a balloon starts rising from ground from rest with an upward acceleration of 2m/^2 .just after 1s ,a stone is dropped from it . the time taken by stone to strike the ground is :-


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Answer 1

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Explanation:

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

Answer 2

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