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Q.

Assertion: If the weight of the lift is equal to the tension force of the cable wire then it moves with uniform velocity
Reason: If the lift moves downward with an acceleration, then the contact force between the boy‘s feet and lift floor is more than the weight of boy

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a

Reason is true, assertion is false

b

Both are true and reason is correct explanation of assertion

c

Both are true and reason not correct explanation of assertion

d

Assertion is true reason is false

answer is C.

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Detailed Solution

When a = 0, T = Mg

(Uniform velocity) ∴assertion is true 

N= m (g-a) = mg-ma
N<mg
∴Reason is false

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