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Q.

A force of 20 N acts on a body of mass 5kg at rest. What is the acceleration of the body? What is its velocity after 5 seconds if the same force acts? After 5 seconds if the force ceases to act then the velocity of the body is……..

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a

4m/s2  ; 20m/s ; 20 m/s

b

2m/s2  ; 10m/s ; 15 m/s

c

2m/s2  ; 8m/s ; 10 m/s

d

3m/s2  ; 15m/s ; 20 m/s

answer is A.

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Detailed Solution

F=20N,  m=5kg,  u=0 a=Fm=205=4ms−2V=u+at=0+4×5=20ms−1If the force ceases to act body moves with uniform velocity. 20 ms-1 velocity as the third part of the answer indicates that the body moves with constant velocity.
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