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Q.

A block of mass M is kept on a platform which is accelerated upward with a constant acceleration 'a' during the time interval T. The work done by normal reaction between the block and platform is

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a

−MgaT22

b

12M(g+a)aT2

c

12Ma2T

d

Zero

answer is B.

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Detailed Solution

Work done by normal reaction=Nh=M(g+a)12aT2=12M(g+a)aT2
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A block of mass M is kept on a platform which is accelerated upward with a constant acceleration 'a' during the time interval T. The work done by normal reaction between the block and platform is