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The graph below shows the variation of a...

The graph below shows the variation of a force `(F)` with time `(t)` on a body which is moving in a straight line. Dependence of force on time is `F prop t^(n)`. Initially body is rest.

If the speed of the object is `2m//s` at `3s`, the speed at `4s` will be approximately (m/s)

A

2.5

B

6.5

C

7.8

D

3.1

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