A bicycle is in motion. The force of friction P exerted by the grou...

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A bicycle is in motion. The force of friction
P exerted by the ground on its wheel is such that

W it acts:
(A) in backward direction on front wheel and in forward direction on rear wheel when it is accelerating by pendaling
(B) in forward direction on front wheel and in backward direction on rear wheel when brakes are applied on rear wheel only
(C) in backward direction on front wheel and in forward direction on rear wheel when brakes are applied on rear wheel only
(D) in backward direction on both the wheels when brakes are applied on front wheel
Which of the following is correct ?
(1) A, B and D'
(2) A and B
(3) A and D
(4) All of these
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