Please Solve This Physics Problem

Question

(a) Evaluate the gravitational potential energy (in J) between two 9.00 kg spherical steel balls separated by a center-to-center distance of 22.0 cm.

(b) Assuming that they are both initially at rest relative to each other in deep space, use conservation of energy to find how fast (in m/s) will they each be traveling upon impact. Each sphere has a radius of 5.50 cm.

Answer 1