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Q.

The mass of a lift is 2000 kg. When  it is moving the tension in the supporting cable is 28000 N, then its acceleration is (g=10ms2)   

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a

4ms2 downwards

b

4ms2 upwards         

c

30ms2 downwards

d

14ms2 upwards        

answer is C.

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Detailed Solution

T=m(g+a)28000=20000+2000a

a=80002000=4ms2up

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