Posted by **nathan** on Tuesday, November 23, 2010 at 2:26pm.

A 20g plastic ball is moving to the left at 30 m/s. How much work must be done th cause the ball to move to the right at 30 m/s?

- physics -
**MathMate**, Tuesday, November 23, 2010 at 4:29pm
Work must be done to stop the ball, which would be equal to the kinetic energy of the ball, or

W1=(1/2)mv²

=(1/2)*0.02*30²

=9 J.

The same work is needed to give the ball the same kinetic energy as before, but in the opposit direction, so

W2=9 J.

The total work required is W1+W2.

## Answer this Question

## Related Questions

- Physics - A tennis ball of mass 57. g bounces off a wall. Right before hitting ...
- Physics 221 - A 20g particle is moving to the left at 30 m/s. How much net work ...
- physics - Ball 2, with a mass of 30kg, is moving to the left at 10m/s. With what...
- physics - Will check my work and help me with the last two problems please? A 4 ...
- Physics - Will you check my work and help me with the last two problems please? ...
- Physics Problems - Will check my work and help me with the last two problems ...
- Physics - A tennis ball of mass 57. g bounces off a wall. Right before hitting ...
- physics - A 0.210 kg plastic ball moves with a velocity of 0.30 m/s. It collides...
- physics - A 0.210 kg plastic ball moves with a velocity of 0.30 m/s. It collides...
- physics - A 0.203 kg plastic ball moves with a velocity of 0.30 m/s. It collides...

More Related Questions