Question

Observer A stands at the top of the cliff and throws a ball straight upwards with a speed of 30 m/s. Observer B is flying in a helicopter that is going straight upward with a speed of 30 m/s. At the moment that observer B passes observer A, B releases a ball. B simply lets go of the ball and does not throw it. (Assume that air resistance has a negligible effect on the balls.)

Be sure to include direction when asked for velocity or acceleration.

1. How does the max height of the ball thrown by A compare to the max height of the ball dropped by B?

2. What does B say the acceleration of the ball he dropped is?

3. When the ball that A threw is at its maximum height, what does A say the velocity is?

4. When the ball that A threw is at its maximum height, what does B say the velocity is?

5. When the ball that B dropped is at its maximum height, what does A say the velocity is?

6. When the ball that B dropped is at its maximum height, what does B say the velocity is?

7. Does B ever say that the ball thrown by A has a velocity of zero? If so, where does this happen?

Now suppose that the helicopter that B is flying in also has a horizontal component of velocity. Now the velocity of the helicopter 30 m/s upward and 40 m/s to the right.

8. When the ball that A threw is at its maximum height, what does A say the velocity is?

1. When the ball that A threw is at its maximum height, what does B say the velocity is?

10. When the ball that B dropped is at its maximum height, what does A say the velocity is?

11. When the ball that B dropped is at its maximum height, what does B say the velocity is?

Now suppose that B’s helicopter is accelerating upward at 9.81 m/s².

50. What does B say the acceleration of the ball he dropped is?

1000. What does A say the acceleration of the ball B dropped is?

14. What does B say the acceleration of the ball A threw is?

Now suppose that B’s helicopter is accelerating downward at 9.81 m/s².

1. What does B say the acceleration of the ball he dropped is?

2. What does A say the acceleration of the ball B dropped is?

3. What does B say the acceleration of the ball A threw is?

Answer 1

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