Q: The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is
(a) 30 ms-2 downwards
(b) 4 ms-2 upwards
(c) 4 ms-2 downwards
(d) 14 ms-2 upwards
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Ans: (b)
28000 = 2000(g + a)
14 = g + a
a = 14-10
= 4 m/s2 upwards