Q.

A body is moving with constant speed, in a circle of radius 10 m. the body completes one revolutions in 4s. At the end of 3rd second, the displacement of body (in m) from its starting point

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a

102

b

15π

c

5π

d

30

answer is B.

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Detailed Solution

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Speed, v = constant 
Radius, R = 10 m 
T = Time period = 4s 
At the end of 3rd second, particle will be at D (Starts from A)
 displacement S=2R=2×10

                                       =102m

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