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From a balloon rising vertically upwards at 5m/s a stone thrown up at 10m/s relative to the balloon . Its velocity with respect to ground after 2s is |
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Answer» n :-From a balloon rising VERTICALLY upwards at 5 m/s a stone thrown up at 10 m/s relative to the balloon . Its velocity with respect to ground after 2 s ISANSWER :-Use the formula from laws of motion :v = U + atGiven :Velocity of balloon w.r.t to ground = 5 m/sVelocity of stone w.r.t to balloon = 10 m/sSo : the initial velocity ( u ) = 10 m/s + 5 m/s = 15 m/sHere a = g = 10 m/s^2 [ acceleration due to gravity ]Here a is acting downwards and hence is NEGATIVE .Now t = 2 sv = u + at= > v = 15 - 10 × 2= > v = 15 - 20= > v = - 5 m/sAnswer :The velocity will be 5 m/s downwards . |
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