Question

A car starts from rest and after 7 seconds it is moving at 42 m/s. what is the car's average acceleration?

A. .17 m/s^2
B. 1.67m/s^2
C. 6m/s^2
D. 7m/s^2

Answer 1

The average acceleration of the car is 6 m/s^2.

Step-by-step explanation:

The average acceleration of the car can be calculated using the formula:

average acceleration = (final velocity - initial velocity) / time

Given that the car starts from rest (initial velocity = 0 m/s), reaches a velocity of 42 m/s in 7 seconds (final velocity = 42 m/s) and the total time is 7 seconds, we can substitute these values into the formula

average acceleration = (42 m/s - 0 m/s) / 7 s = 6 m/s^2

Therefore, the car's average acceleration is 6 m/s^2 (option C).