Question

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Answer 1

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(7)Uniform circular motion is motion in a circle at constant speed.

Centripetal acceleration →aC a → C is the acceleration a particle must have to follow a circular path. Centripetal acceleration always points toward the center of rotation and has magnitude aC=v2/r. a C = v 2 / r .

Answer 2

Answer:

1) The magnitude of change in velocity of the ball is 60 m/s.

We can say that initial velocity is 30 m/s and when it rebounds its direction changes i.e. final velocity is (-30 m/s). The change in velocity is given by final velocity minus initial velocity as : So, the magnitude of change in velocity of the ball is 60 m/s.Jul 21, 2019

2)When a particle moves with a constant speed in the same direction, neither the magnitude nor the direction of velocity changes and so acceleration is zero. In case a particle rebounds instantly with the same speed, its acceleration will be infinite which is physically not possible.

Explanation:

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