- #1

- 4

- 0

## Homework Statement

Two solid copper spheres of radii 1 and 2 cm are released from rest in free space, their centers being 20 cm apart. Estimate the velocity with which they collide

## Homework Equations

density =mass/volume

F=GMm/r^2

## The Attempt at a Solution

Find mass of each from density of copper and volume.

With mass and separation I can find force and initial acceleration towards each other.

This force changes with distance, so how would I take account of this in my solution?

Many thanks for any prompts.