Practice question
Question
A 1kg ball moving at 8m/s undergoes an elastic collision with a stationary 3kg ball. What is the speed of the 1kg ball after collision?
Explanation
For elastic collision, momentum and kinetic energy conserved: m1v1+m2v2=m1v1'+m2v2' and ½m1v1²+... per NCERT. Solving gives velocities matching 4 m/s. Inelastic loses energy. So option A is correct.