Question: The speedometer of an automobile reads

A) average speed.

B) instantaneous speed.

C) accelerated speed.

Answer: b. instantaneous speed

Question: The two measurements necessary for calculating average speed are

Answer: distance/time

Question: A vehicle undergoes acceleration when it

Answer: gains speed, loses speed, and changes its direction

Question: If an object moves with constant acceleration, its velocity must

Answer: change by the same amount each second

Question: A rock dropped from a 5-m height accelerates at 10 m/s2 and strikes the ground 1 s later. If the rock is dropped from a height of 2.5 m, its acceleration of fall is

Answer: same

Question: A freely-falling watermelon falls with constant

Answer: acceleration

Question: While an iron block near the Earth’s surface is in free fall, it undergoes an increase in

Answer: speed and acceleration

Question: The distance a freely falling bowling ball falls each second

Answer: increases

Question: If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by

Answer: about 10 m/s

Question: a ball thrown upwards and returns to the same location. compared with its initial speed it’s speed when it returns is about

Answer: the same