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B) 300 J Kg^-1C^-1

Explanation:

By the formula of specific heat,

                                 Q=mcT

where Q is heat energy

           m is mass

           c is heat capacity

           T is change in temperature

By the given data,

                             Q = 15 KJ = 15 x 1000 = 15000J

                             m = 5 kg

                             T = 30°C - 20°C = 10°C

Now,

                            c=

                            c =

                            c = 300 J Kg^-1C°^-1

inverse v=i*r

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