A person reaches a maximum height of 56 cm when jumping straight up from a crouched position. During the jump itself, the person's body from the knees up rises a distance of around 50 cm . To keep the calculations simple and yet get a reasonable result, assume that the entire body rises this much during the jump. 1. With what initial speed does the person leave the ground to reach a height of 56 cm? 2.In terms of this jumper's weight W , what force does the ground exert on him or her during the jump?

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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.