Physics Review Question

Unit: MECHANICS
Year: 1993 Question#: 5
Question: AN OBJECT ACCELERATES UNIFORMLY FROM REST TO A SPEED OF 50. METERS PER SECOND IN 5.0 SECONDS. THE AVERAGE SPEED OF THE OBJECT DURING THE 5.0-SECOND INTERVAL IS

(1 ) 5.0 m/s
(2 ) 10. m/s
(3 ) 25 m/s
(4 ) 50. m/s

What is this question really asking?




Explanation by: DIANA L.
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Answer 1
5.0 m/s

INCORRECT

You are looking for the average velocity. Since the acceleration is uniform, the avg velocity is just the avg of the initial and final velocities. return to top























Answer 2
10. m/s

INCORRECT

CHECK YOUR MATH! You are looking for the average velocity. Since the acceleration is uniform, the avg velocity is just the avg of the initial and final velocities. return to top



























Answer 3
25 m/s

CORRECT

avg v = (vf + vi) /2
=(50 m/s +0 m/s) /2
=25 m/s return to top


























Answer 4
50. m/s

INCORRECT

CHECK YOUR MATH! You are looking for the average velocity. Since the acceleration is uniform, the avg velocity is just the avg of the initial and final velocities. return to top


























What's this question really asking?

WHAT IS THE AVERAGE VELOCITY OF THE OBJECT? return to top

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