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Q.

The force F which is applied to 1kg block initially at rest varies linearly with time as shown in the figure. Find velocity of the block at t=4s. 

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a

200 m/s

b

110 m/s

c

100 m/s

d

10 m/s

answer is B.

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Detailed Solution

 The area of force - Time graph = Change in momentum

= Impulse   pf-pi=12×100×4=200  or  mv-0=200  v=200 m/s

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