Posted by **Mack** on Sunday, December 4, 2011 at 8:00pm.

A 500g ball is dropped into a well that is 10m deep. A)What is the ball's potential energy before it is dropped? Take the bottom of the well to be at zero height. I solved by using PE=mgh and came up with 49J. B) What are the kinetic energy and potential energy when it has fallen 7m? How fast is it traveling at this point? I used PE=mgh but used 3m for h and came up with 14.70J. Then solved KE=1/2MV^2 and used 7m for h and came up with 34.28J. I know these two have to equal the starting PE due to law of conservation of energy which they come pretty close. Did I do this right or did I use the wrong numbers in h?..Then for the last part I used V=sqrt2gh and came up with 11.71 m/s. I appreciate any assistance or pointers on this.

## Answer this Question

## Related Questions

- Physics - A 500g ball is dropped into a well that is 10m deep. A)What is the ...
- physics - a ball has a mass of 0.5kg dropped from a cliff top, the ball srtikes ...
- science - A bouncy rubber ball is dropped from a height of about a metre above ...
- PHYSICS - Long, long ago, on a planet far, far away, a physics experiment was ...
- physics - Long, long ago, on a planet far, far away, a physics experiment was ...
- PHISIC - A bouncy rubber ball is dropped from a height of about a metre above ...
- chemistry - when a ball is dropped throuh a height, its potential energy changes...
- Physics - A rubber ball with a mass of 0.130 kg is dropped from rest. From what ...
- physics - a superball of mass .125 kg is dropped onto a concrete floor from a ...
- physics - A lead ball is dropped into a lake from a diving board 5.24 m above ...