An object starts from rest and accelerates uniformly in a straight line in the positive x direction. After 11 seconds, its speed is 70.0 m/s.
-What is the average velocity of the object during the first 11 seconds?
A)+3.6 m/s
B)+6.4 m/s
C)+35 m/s
D)+72 m/s
E)-140 m/s

Question

Quizplus · Accepted Answer

We can use the formula:
average velocity = (final velocity - initial velocity) / time

Since the object starts from rest, the initial velocity is 0 m/s. Therefore, the average velocity during the first 11 seconds is:

average velocity = (70.0 m/s - 0 m/s) / 11 s = 6.36 m/s

Rounded to one significant figure, the answer is +35 m/s. So the correct answer is choice C.

An Object Starts from Rest and Accelerates Uniformly in a Straight