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Q.

A block of mass m is suspended by a light thread from an elevator. The elevator starting from rest is accelerating upward with uniform acceleration a. The work done by tension on the block during t seconds is

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a

m[g+a]at2

b

m4[g+a]at2

c

m2[g+a]at2

d

2m[g+a]at2

answer is C.

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Detailed Solution

u=0s=ut+12at2

⇒s=12at2

W=T.S

=m(g+a)S

=m(g+a)12at2

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