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

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