Question

a ball hits a wall with 30m/s and rebounces back with same velocity. what is the change in velocity?​

Answer 1

Answer:

There's no change in velocity dear...........................only direction of velocity changes

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Answer 2

Answer:

60 m/s

Explanation:

Since it bounces back with the same velocity , it means that there is no change in the magnitude of the velocity .

However , since the direction becomes opposite of the initial direction  , the sign gets reversed .

The change in velocity is given as ,

initial velocity = 30 m/s

final velocity = -30 m/s

change in velocity = initial velocity - final velocity

                               = 30 - ( -30 )

                               = 30 + 30

                               = 60 m/s

Hence the change in velocity is 60 m/s