See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

v0cos 30 = v cos 45 0 3 2 v v   Now using conservation of energy   2 2 0 1 2 m v v mgh   2 2 0 0 3 2 2 v v gh   2 0 2 2 v gh   4 4 10 3.6 12 / v gh m s      