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Q.

A body of mass 2kg has an initial speed 5ms–1. A force acts on it for 4 seconds in the direction of motion. The force time graph is shown in figure. The final speed of the body is

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a

8.5 ms–1

b

11 ms–1

c

14.31 ms–1

d

4.31 ms–1

answer is C.

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Detailed Solution

Area under F-t curve gives impulse.
J=Δp=m(vu)

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A body of mass 2kg has an initial speed 5ms–1. A force acts on it for 4 seconds in the direction of motion. The force time graph is shown in figure. The final speed of the body is