A \(90-\mathrm{kg}\) halfback on a football team runs head-on into a \(120-\mathrm{kg}\) opponent at an instant when neither has his feet on the ground. The halfback is initially going west at \(10 \mathrm{~m} / \mathrm{s}\), and his opponent is initially going east at \(4.37 \mathrm{~m} / \mathrm{s}\). The collision is totally inelastic.

(a) If the collision takes \(0.207 \mathrm{~s}\), what is the acceleration of each player?

(b) How much kinetic energy is converted to incoherent energy during the collision?