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Question

The displacement x of a particle at time t is given by x=At2+Bt+C where A, B, C are constants and v is velocity of a particle, then the value of 4Axv2 is:

A
4AC+B2
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B
4ACB2
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C
2ACB2
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D
2AC+B2
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Solution

The correct option is C 4ACB2
x=At2+Bt+C(i)
v=2At+B
v2=4A2t2+4ABt+B2(ii)
{By multiplying 4A in Eq. (i) }
4Ax=4A2t2+4ABt+4AC(iii)
{from Eq. (i) and Eq. (iii)}
v24Ax=B24AC
4Axv2=4ACB2

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