A steel ball weighting 1 kg is fastened to a cord 1 m long and is released when the cord is horizontal . At the bottom of its path the ball strikes a 5-kg steel block initially at rest on a frictionless surface . The collision is elastic . Find the speed of the ball and speed of the block just after collision . (g = `9.8 m s^(-2)`)
[Hint : Apply principal of conservation of momentum and conservation of kinetic energy as the collision is elastic .]

Answer

`-2.95 m s^(-1) "and" 1.476 m s^(-1)` respectively