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A block of mass 20 kg is set into motion...

A block of mass 20 kg is set into motion on a frictionless horizontal surface with the help of massless smooth pulley and rope as shown in the figure. Find the acceleration of the pulley

A

5 m/`s^2`

B

1.25 m/`s^2`

C

1.5 m/`s^2`

D

1 m/`s^2`

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