NCERT Exercise 7.20 - Gravitation
Question: Two equal solar-mass stars approach head-on from rest at 10^9 km separation and collide when their centres are 2 x 10^4 km apart. Find collision speed of each.
Answer: Each star collides at **about 3.7 x 10^6 m/s**.
Full step-by-step NCERT solution with diagrams on Something by Zero.