A particle moves in a horizontal straight line under retardation kv3, where v is the velocity at time t and k is a positive constant. If initial velocity be u and x be the displacement at time,then which one is correct?

A particle moves in a horizontal straight line under retardation kv3,

1.	A particle moves in a horizontal straight line under retardation kv3, where v is the velocity at time t and k is a positive constant. If initial velocity be u and x be the displacement at time,then which one is correct?
A.	1/v = 1/u + kx
B.	1/v = 1/u – 2kx
C.	1/v = 1/u – kx
D.	1/v = 1/u + 2kx
Answer» B. 1/v = 1/u – 2kx

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A particle moves in a horizontal straight line under retardation kv3, where v is the velocity at time t and k is a positive constant. If initial velocity be u and x be the displacement at time,then which one is correct?

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