A) is zero if the vehicle is moving with a uniform velocity
B) is towards east if the vehicle is accelerating
C) must be towards east
D) must be towards west
Correct Answer: B
Solution :
When vehicle is moving with uniform velocity, its acceleration is zero, and external force applied is zero. Therefore, force of friction is zero. When vehicle is accelerating towards east, force exerted by rear wheels on the ground make force of friction acting in the forward direction ie, towards east.
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