8. (a) A cup of coffee of mass 250 grams sits on a table in a train carriage. The train accelerates at 1.2 m/s? out of a station. Draw the free body diagram of forces acting on the cup of coffee. (i) If the cup does not slip, find the value of the friction force acting on the cup of coffee. (i) If the cup is just about to slip, find the coefficient of friction between the cup and the surface of the table. (b) Two bodies with kinetic energies in the ratio 4:1 is moving with equal linear momentum. What is the ratio of their masses?

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