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The momentum of a particle is P = A + Bt...

The momentum of a particle is `P = A + Bt^(2)` . Where , A and B are constant perpendicular vectors . The force acting on the particle when its acceleration is at `45^(@)` with its velocity is
(a)`2 sqrt((A)/(B)) B ` (b)2B (c)zero (d)2A

A

`2 sqrt((A)/(B)) B `

B

2B

C

zero

D

2A

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