JEE Main 23 Jan 2026 Shift 1 Paper Solved Paper

In a perfectly inelastic collision, two spheres made of the same material with masses 15 kg and 25 kg , moving in opposite directions with speeds of 10m∕s and 30m∕s, respectively, strike each other and stick together. The rise in temperature (in ‌∘C ), if all the heat produced during the collision is retained by these spheres, is :
(specific heat of sphere material 31cal∕kg.‌∘C and 1cal=4.2J )