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Question

A lift is moving upwards with a uniform velocity v in which a block of mass m is lying. The frictional force offered by the block, when coefficient of friction is μ=0.5, will be

A
Zero
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B
mg2
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C
mg
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D
2mg
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Solution

The correct option is A Zero
There is no force parallel to the plane , and static friction occurs when we try to apply some force on the body to displace it and friction opposes the relative motion .Here there is no driving force so frictional force is zero.

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