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Questions  

A particle of unit mass undergoes one-dimensional motion such that its velocity varies according to

v(x)=βx-2n

where β and n are constants and x is the position of the particle. The acceleration of the particle as a function of x, is given by

a
-2β2x-2n+1
b
-2nβ2e-4n+1
c
-2nβ2x-2n-1
d
-2nβ2x-4n-1

detailed solution

Correct option is D

According to question, velocity of unit mass varies asv(x)=βx-2n                                          . . . .(i)dvdx=-2nβx-2n-1                        . . . .(ii)Acceleration of the particle is given by a=dvdt=dvdx×dxdt=dvdx×vUsing equation (i) and (ii), we get a=-2nβx-2n-1×βx-2n=-2nβ2x-4n-1

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