Question

# A 1-kg ball is released from a height of 6 m, and a 2-kg ball is...

A 1-kg ball is released from a height of 6 m, and a 2-kg ball is released from a height of 3 m. Air resistance is negligible as they fall. Which of the following statements about these balls are correct? (There could be more than one correct choice.)

 Both balls will reach the ground with the same speed. As they reach the ground, the 1-kg ball will have more kinetic energy than the 2-kg ball because it was dropped from a greater height. Both balls will reach the ground with the same kinetic energy. As they reach the ground, the 1-kg ball will be moving faster than the 2-kg ball. Both balls will take the same time to reach the ground.

Answer: Third and fourth options are correct.

• Both balls will reach the ground with the same kinetic energy.
• As they reach the ground, the 1-kg ball will be moving faster than the 2-kg ball.

Explanation:

A 1-kg ball (m1) is released from a height of 6 m (h1) , and a 2-kg ball (m2) is released from a height of 3 m (h2).

Air resistance is negligible as they fall.

So,

And,

Kinetic energy for ball of 1 kg,

Kinetic energy for ball of 2 kg,

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