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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`

Text Solution

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The correct Answer is:
B
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