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Two points move in the same straight line starting at the same moment from the same point in it. The first moves with constant velocity u and the second from rest with constant acceleration f.  Before the second catches the first , the greatest distance between the particle is

a
uf
b
u22f
c
f2u2
d
fu2

detailed solution

Correct option is B

The greatest distance is, when velocities of both are equal.orft=u⇒t=uf s1=ut=u2f and s2=12ft2=u22f  smax=s1-s2=u22f

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