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a) Someone wanting to sell you a super ball claims’ that it will bounce to a height greater than the height from which it is dropped. Would you buy this ball? If yes explain, if not explain.

b) A ball, initially at the top of the inclined hill, is allowed to roll down: At the bottom its speed is 4 m/s. Next, the ball is again rolled down the hill, but this time it does not start from rest. It has an initial speed of 3 m/s. How fast is it going when it gets to the bottom?

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a) Yes. I will buy this ball. When the applied force is more, the ball bounce to a height greater than the height from which it is dropped.

b) A ball start from the top of an inclined plane u = 0 m/s; v, = 4 m/s.

Let the acceleration a’ and distance ’s’.

v12 – u12 = 2as …………. (1) 

Now the ball is rolled down from the top of an inclined plane with a velocity 3 m/s. 

∴ u2 = 3 m/s; v2 =? 

Here the acceleration of the inclined plane is ‘a’ and the distance is ‘s’.

Substitute the values u1 = 0 m/s, v1 = 4 m/s , u2 = 3 m/s.

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