A lift starts moving down with a constant accelaration 15m/s^2. A coin initially is at rest on the floor of lif. The height of lift is 2.5m. How much time will it take to touch the ceiling of the lift. (g=10m/s^2)
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copper 0.5 kg supplied 8 kilo calories heat initial temperature was 40 degree centigrade its specific heat is 0.09 final temperature of copper is
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