1 ) A rock is thrown straight up and reaches a maximum height. Which of the foll

Question

1 ) A rock is thrown straight up and reaches a maximum height. Which of the following describes the motion at the maximum height?
A) The velocity is zero and the acceleration is zero.
B) The velocity is maximum and the acceleration is zero.
C) The acceleration is increasing and the velocity is zero.
D) The acceleration is not changing and the velocity is zero.

2 ) Two balls are thrown from the top of a building. One is thrown up and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?
A) They are traveling at the same speed.
B) The one thrown down is traveling faster.
C) The one thrown up is traveling faster.
D) It depends on the height of the building.

Explanation / Answer

1. D) The acceleration is not changing and the velocity is zero. 2.A)They are traveling at the same speed.

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