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Q.

A body is projected vertically up with a velocity of 98m/s. After 2s if the acceleration due to gravity disappears, the velocity of the body at the end of the next 35 is,

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a

49 m/s 

b

47.6 m/s   

c

78.4 m/s  

d

 94.7 m/s

answer is C.

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Detailed Solution

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After 2sec

v=u+at

=989.8×2

=9818.6=78.4  m/s

If ‘g’ is absent, the body moves with uniform velocity

v=78.4  m/s

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