Object A has mass of m and object B has mass of 3m, if the two objects have the same kinetic energy, the velocity of A is O a. equal to the velocity of B O b. half the velocity of B O c. three times the velocity of B d. twice the velocity of An object of mass 5 kg kept on a rough surface is pulled by a forward force of 18 N. If the object has 0.66 m/s^2 acceleration, the coefficient of kinetic friction is a. 0.04  b. 0.277  c. 0.3 d. 0.132

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.