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Q.

A force acts for 0.1 s on a body of mass 1.2 kg initially at rest. The force then ceases to act, and the body moves through 2 m in the next one second. The magnitude of the force will be


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a

26 N

b

24 N

c

14 N

d

45 N 

answer is B.

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Detailed Solution

A force acts for 0.1 s on a body of mass 1.2 kg initially at rest. The force then ceases to act, and the body moves through 2 m in the next one second. The magnitude of the force will be 24 N.
Initial motion of body (u) = 0 m/s
Final motion of the body v= s/t
v= 2/1
= 2 m/s
From the 1st equation of motion we have
u=v+at 
=>a=2-00.1
=>a=20 m/s2
Now, from the relation of Newton’s second law
=>= ma 
=>= 1.2 × 20
= 24 N
 
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