A 10 g block slides with a velocity of 20 cm/s on a smooth level surface and makes a collision with a 30 g block moving in the opposite direction with a velocity of 10 cm/s. If the collision is perfectly elastic, 4. what is the velocity of the 30 g block after the collision? a. 20 cm/s c. 15 cm/s b. 5 cm/s d. 10c m/s

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