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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

0.6

B

0.52

C

0.44

D

0.35

Text Solution

Verified by Experts

The correct Answer is:
D
`mu_(e) mg le 75 N`
`rArr mu_(e) le 75/(20 g) = 0.35`
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