Two particles A and B are initially at rest at the origin. They simultaneously start moving along positive x-axis, ‘A’ with constant velocity u and B with constant acceleration ‘a’. Then find the separation between the particles when their relative velocity is zero.

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u24a

u22a

u2a

2u2a

answer is B.

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Detailed Solution

Relative velocity at time t, Vr=u−atInitially acceleration, ar=−aUsing Vr2=ur2+2arxr,O=u 2+2−a . xr⇒ xr=u22a

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