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Q.

A car of mass m is traveling at a slow velocity  V0 . It is subjected to a drag resistance of the wind which is proportional to its velocity, the constant of proportionality being k. The distance covered by the car before its speed becomes half is_____ ___

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a

mv04k

b

mv02k

c

2mv0k

d

mv0k

answer is C.

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Detailed Solution

a=Fm=kvmorvdvds=kvmor v0v0/2dv=km0sds
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