Posted by **Sam** on Saturday, October 22, 2011 at 1:57pm.

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 94.0 kg. The mass of the rock is 0.350 kg. Initially the wagon is rolling forward at a speed of 0.520 m/s. Then the person throws the rock with a speed of 17.5 m/s. Both speeds are relative to the ground. Find the speed of the wagon after the rock is thrown directly forward.

- physics -
**drwls**, Saturday, October 22, 2011 at 2:04pm
Total momentum is constant.

Write that as an equation and solve for trhe new wagon speed, V'.

94*0.52 = 93.65 V' + 0.345*17.5

If the rock had been trown backwards, there would be a minus sign before the last term.

## Answer this Question

## Related Questions

- physics - A wagon is rolling forward on level ground. Friction is negligible. ...
- Physics - A wagon is rolling forward on level ground. Friction is negligible. ...
- physics - A wagon is rolling forward on level ground. Friction is negligible. ...
- physics - A wagon is rolling forward on level ground. Friction is negligible. ...
- College Physics - A wagon is rolling forward on level ground. Friction is ...
- Physics 141 - A wagon is rolling forward on level ground. Friction is negligible...
- Physics - A wagon is rolling forward on level ground. Friction is negligible. ...
- Physics - A wagon is rolling forward on level ground. Friction is negligible. ...
- Physics - A wagon is coasting at a speed, vA, along a straight and level road. ...
- Physics - A wagon is coasting at a speed vA along a straight and level road. ...

More Related Questions