A balloon raises up with uniform velocity u. A body is dropped from balloon. The time of descent for the body is given by the equation
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When stone is dropped from a rising balloon it has a initial velocity of 10m/sec in upward direction.
Taking downward direction as positive end
S=ut+
2
1
at
2
40=−10×t+
2
1
×10×t
2
5t
2
−10t−40=0
t
2
−2t−8=0
(t−4)(t+2)
t=4 or t=−2 (negative time is nos possible)
So, t=4s
Taking downward direction as positive end
S=ut+
2
1
at
2
40=−10×t+
2
1
×10×t
2
5t
2
−10t−40=0
t
2
−2t−8=0
(t−4)(t+2)
t=4 or t=−2 (negative time is nos possible)
So, t=4s
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