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A large flat board is lying on a smooth ...

A large flat board is lying on a smooth ground. A disc of mass m = 2 kg is kept on the board. The coefficient of friction between the disc and the board is m = 0.2 . The disc and the board are moved with velocity `vec(u)=2hatims^(-1)` and `vec(V)=2hatJ ms^(-1)` respectively [in reference frame of the ground]. Calculate the power of the external force applied on the disc and the force applied on the board. At what rate heat is being dissipated due to friction between the board and the disc? [`g = 10 ms^(2)`]

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