Brain teaser 8

Classical Mechanics Level pending

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

NOTE :---THE VALUE OF 'PIE' IS TAKEN 3.14

3.18 m/s^2 0 m/s^2 31.4 m/s^2 10 m/s^2

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