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Q.

The force acting versus time graph of a rocket is shown in figure. The mass of the rocket is $1200 k g$ . The velocity of rocket $16$ seconds after starting from rest will be (neglect gravity) :

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a

$50 m / s$

b

$100 m / s$

c

$200 m / s$

d

$300 m / s$

answer is C.

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Detailed Solution

$m v = \int F d t = \frac{1}{2} \times 20 \times (8 + 16) \times 10^{3} 1200 v = 24 \times 10^{4} v = 200 m / s$

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