A 0.5 kg block, block-A, sliding frictionless in the x-direction at an initial speed of 1.5 m/s, collides with a stationary block, block-B, of mass m . The collision is elastic. After the collision, block-A continues traveling in its original direction at 0.7 m/s. (a) What is the mass of the second block? (b) What is its speed after the collision ? (c) What is the speed of the center of mass of the two blocks? Note: The velocity of the CM for a system of particles is calculated similarly to the position of the CM. (d) If the block-A is in contact with block-B for 0.2 ms, what is the average force applied on block-B? (e) What is the impulse?​