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let s be the height reached by the balloon afetr 8 sec s= 1/2 * 1.25 *64=40m now velocity of balloon afetr 8 sec , v= 1.25 * 8=10m/s this is the initial velocity of the stone.now, 40 = -10t + 5t^2 t=4 sec [time is not negative and so t=-2 is rejected.] ans a) 40m b)4 sec
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NIT silchar electrical engineering |
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