# Solution: What is the velocity of the 30 g block after the collision?

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.

#### Problem Statement: EE Board October 1996

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, what is the velocity of the 30 g block after the collision?

• A. 15 cm/s
• B. 10 cm/s
• C. 25 cm/s
• D. 5 cm/s

The velocity of the 30 g block after the collision is 5 cm/s.

Solution:

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