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A solid ball of mass 10 kg at 40^(@)C is...

A solid ball of mass `10 kg` at `40^(@)C` is gently placed in a liquid of mass `20 kg` at `20^(@)C` and of specific heat capacity `1 cal//gm-^(@)C`. When the thermal equilibrium is attained, temperature of the system is `35^(@)C`. The specific heat capacity of solid ball is. Neglect heat capacity of the vessel.

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