Question

Question 9:
(a) When an athlete comes running from a distance, he is able to jump longer. Why?

(b) The velocity-time graph of a ball of mass 20 g moving along a straight line on a long table is given in figure. How much force does the table exert on the ball to bring it to rest?

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Answer 1

he attains some energy and to overcome the air friction .

Answer 2

Answer:

Explanation:

a) An athlete runs before jumping to gain momentum. Because it helps in jumping higher and longer because of inertia of motion....

b)?