A block-2 of mass 1.5kg is at rest on a frictionless surface attached with the free end of a unstretched spring of spring constant 250N//m as shown in figure-3. The other end of the spring is fixed to a wall. Block-1 with mass 2.5kg is travelling at a speed v_(1)=4.5m//s, collides with block-2 and the collision is elastic. Find out a) [3 marks] the velocity of block-1 after the collision. b) [3 marks] the impulse on the block-2 due to block-1. c) [4 marks] the compression of the spring when it momentarily stops.