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A spring balance fastened to the roof of a lift accelerating upwards indicates `120 N` as the weight of a `80 N` body. The acceleration of the lift is `(g = 10 m//s^(2))`. A. `5 m//s^(2)` upwardsB. `(20)/(3) m//s^(2)` upwardsC. `(10)/(3) m//s^(2)` upwardsD. `5 m//s^(2)` downwards |
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Answer» Correct Answer - A `m (g + a) = 120 " " mg = 80` `mg + ma = 120 " " m = 8` `80 + ma = 120` `ma = 40` `a = (40)/(8) = 5 m//s^(2)` |
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