# Projectile Mania

**Classical Mechanics**Level 4

2 balls of equal mass \(2 \text { kg} \) are kept on flat ground at a distance \(D\) from each other. They are thrown towards each other at an angle \(\theta\) with a speed \(v\). They collide in mid-air elastically. Find the distance between them when they first come back to ground after collision.

**Details and Assumptions**:

- \(D = 80 \text{ m} \), \(\theta = 37^\circ\), \(v = 50 \text{ m/s} \), \(g = 10 \text{ m/s}^{2}\).