Q. Two masses undergo a perfectly elastic head on collision. The first mass m moves with initial velocity of 50 m/s in the + ve x direction . The second mass 2m moves with initial velocity of 40 m/s in the – ve x direction.

(i) Calculate their final velocities (ii) What is the ratio of their final K.E to the initial K.E for mass 'm' (iii) calculate the change in momentum of masses m and 2 m if milk (iv) What is the change in momentum of the system :

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