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4 body falls from a height of 200 m. If gravitational attraction ceases after 2 s, furthertunetaken by it to reach the ground is(g-10 m say.a. |
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Answer» After 2 seconds velocity is vv = u+atu=0 ,a=-gv = -2g =-20m/s (downward)distance covered in 2 second = Sv2 = u2+2aSu=0 , a=-gS = v2/2a = 400/20 =20it has covered 20 m so remaining distance from ground is 200-20 = 180mnow gravity there is no gravity effect so a=0now we use speed = distance/timet = d/vdistance = 180 ,velocity = 20t = 180/20 = 9secthus body will take further 9 sec to reach the ground but the answer is 13 seconds |
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