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Q.

A Particle moves uniformly with speed v along the parabolic path y=kx2. Taking k as a positive constant, the magnitude of acceleration of the particle at x=0 is given by:

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a

kv22

b

kv2

c

kv24

d

2kv2

answer is A.

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Detailed Solution

At  x=0, vy=0; vx=v and ax=0;           [ particle moves uniformly] 

vy=2kxvx;       ay=2kvx2+xax;       ay=2kv2 a=2kv2 j^ 

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