A 15 g bullet strikes and embeds in a 2.6 kg block suspended at the end of a 1.3 m string. After the collision the string rises to a maximum angle of 20 degrees to the vertical. Find: a) the speed of the bullet: m/s b) the percentage loss in kinetic energy due to the collision: %

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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.