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Q.

A body projected vertically up with a velocity of 58.8 m/s. After 3s if the acceleration due to gravity of earth disappears then the distance travelled and the velocity of the body at the end of next 5 sec is 

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a

147m,29.4m/s

b

29.4m,147m/s

c

14.7m,2.94m/s

d

19.6m,240m/s

answer is A.

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Detailed Solution

v=u-gt
After 3 seconds it move with constant velocity

v=58.8-3(9.8)=29.4 m/s

distance travelled =5x29.4 =147 m

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