# A particle is moving along a circular path of radius 5m and with uniform speed 5 m/s. What will be the average acceleration when the particle completes half revolution

A particle is moving along a circular path of radius 5m and with uniform speed 5 m/s.  What will be the average acceleration when the particle completes half revolution?

(A) zero
(B) 10 m/s2
(C) 10 π m/s2
(D) 10/π m/s2

Solution :  The change in velocity when the particle completes half revolution is given by
Dv = 5 m/s – (-5 m/s) = 10 m/s
Time taken to complete half revolution
t = π r/v = π×5/5 = π
Average acceleration  = Δv/Δt =10/π m/s2

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