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If the speed-position (v-x) relation of ...

If the speed-position `(v-x)` relation of a particle moving in a straight line is given as `v^(2)=a-bx^(2)` (where a and `b` are constants) then the acceleration of the particle is proportional to
(1) `x^(4),`
(2) `x`
(3) `x^(3),`
(4) `x^(2)`

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