The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is :

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14 ms-2,upwards

30 ms-2 downwards

4 ms-2 upwards

4 ms-2 downwards

answer is C.

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Detailed Solution

T - mg = ma= 28000 - 20000 = 2000 a= a = 4m/s2

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