Posted by **Victoria** on Sunday, March 28, 2010 at 4:15pm.

Two softballs, each with a mass of 0.125 kg, are separated by a distance of 820 m in outer space.

a. If the balls are released from rest, what speed do they have when their separation has decreased to 680 m? Ignore the gravitational effects from any other objects.

- Physic -
**bobpursley**, Sunday, March 28, 2010 at 4:27pm
Hold one ball fixed (a virtual fixed).

work the other ball does

work=integral F dx= G.125^2/r^2 dr from 820 to 680

work= -G*.125^2 (1/820-1/680)

figure that out. But we know in the real world, both balls moved, so divide that work by 2 to get the work done on each ball, and that is equal to the KE of each ball.

From KE, get the velocity.

## Answer this Question

## Related Questions

- Physics - Two baseballs, each with a mass of 0.157 kg, are separated by a ...
- Physics - Suppose that each of the three masses in the figure below has a mass ...
- Physics - Two identical balls each have a charge of -7.5x10^-6C. The balls hang ...
- Physic - Two charges of equal magnitude of 2C and mass of 1.0 g are separated by...
- John muir - Coach Coleman has 32 softballs left from last season, but 3 are torn...
- Physics - Speed of Asteroids With the same Radius? Two spherical asteroids have ...
- physics - Two small plastic balls hang from threads of negligible mass. Each ...
- mtah problem - the girls gym teacher needs to purchase 15 softballs, 5 package ...
- physics - Two identical balls each have a charge of -7.5x10^-6C. The balls hang ...
- physics - A 500-kg cannon and a supply of 80 cannon balls, each with a mass of ...

More Related Questions