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
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.