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A20 kg block is initally at rest. A 75 N...

A20 kg block is initally at rest. A 75 N force is required to set the block in motion. After the motion starts, a force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is

A

` 0.62`

B

`0.52`

C

`0.44`

D

`0.375`

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The correct Answer is:
D
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