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Consider a vehicle going on a horizontal...

Consider a vehicle going on a horizontal rod towards east. Neglect any force by the air. The frictional forces on the vehicle by the road

A

is towards east if the vechicle is moving with a unifrom velocity

B

is towards east if the vehicle is accelerating

C

must be towards east

D

must be towards west

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The correct Answer is:
b,d
When vehicle is moving with unifrom velocity its acc =0 external force applied = 0 Therefore force of friction =0 When vehicle is accelerating towards east force exerted by near wheels on the ground makes force of friction act in the forward direction towards east .
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