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If the force is given by F=at+bt^(2) wit...

If the force is given by `F=at+bt^(2)` with `t` is time. The dimensions of `a` and `b` are

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The correct Answer is:
B

By mechanical energy conservation
`(PE+KE)_(i)=(PE+KE)_(f)`
`0+1/2 mv^(2)+0=(KQ^(2))/d+1/2 m (v/2)^(2)xx2`
( `:'` from momentum conservation at closet approach, both particle will move with a common speed `v//2`)
`:. D=(4KQ^(2))/(mv^(2))`
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