Question

A 2kg ball moves to the left at 20 m/s. How much work must be done...

A 2kg ball moves to the left at 20 m/s. How much work must be done to cause the ball to move to the right at 25 m/s?

25 J

225 J

625 J

1025 J
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Homework Answers

Answer #1

Kinetic energy of the ball when towards left

Kinetic energy of the ball when moving towards right

By Work-Energy theorem, the net workdone on the body is equal to the  change in Kinetic energy of the body.

Therefore, workdone to cause the ball to move towards right at 25 m/s is

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