20 n block is placed on an inclined plane and connected to a 10 n hanging block by a cord that passes over a frictionless pulley. the coefficient of kinetic friction between block and plane is 1/3. find one value of angle ꝋ so that the hanging block will move downward at constant velocity once set in motion. Note: You don’t have to answer the whole question. Please just explain to us how to get the 31 number in the picture. Thank you.

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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.