Two small balls A and B have mass 0.6 kg and 0.2 kg respectively. They are moving towards each other in opposite directions to collide directly. Immediately before the collision, the speed of A is 8 m/s and the speed of B is 2 m/s. immediately after the collision, the direction of motion of A is unchanged and the speed of B is twice the speed of A. Find: The speed of A immediately after the collision,  The magnitude of the impulse exerted on B in the collision?

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