Q.

Consider an at wood machine in an upward accelerating elevator. The elevator starts from rest

            at t = 0. Mark the correct statements

            Given m1=m2=m

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a

acceleration of both the blocks are same for an inertial observer

b

at any time, speed of both blocks may be same

c

at any time, speed of both blocks may be different

d

tension in string connecting blocks is mg during upward acceleration of elevator

answer is A.

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Detailed Solution

a) As the masses of Blocks are same. So, net force on any of the blocks is samea1=a2=a

Initially blocks are at rest v1=v2 

c) If initially the blocks have same velocity with respect to pulley then their velocities will be

                different at any time

d)T=mg+aT>mg 

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Consider an at wood machine in an upward accelerating elevator. The elevator starts from rest            at t = 0. Mark the correct statements            Given m1=m2=m