Question

Two cars are having a drag race. They start from rest and the blue car obtains a speed of 46.2 m/s after just 4.2 seconds. What is the blue car's acceleration?

A) 11 m/s²
B) 10.5 m/s²
C) 11.5 m/s²
D) 10 m/s²

Answer 1

The blue car's acceleration is found by dividing the final velocity (46.2 m/s) by the time taken (4.2 s), resulting in an acceleration of 11 m/s².

Step-by-step explanation:

To calculate the acceleration of the blue car we will use the formula for uniform acceleration, which is:

a = (v - u) / t

where:

a is the acceleration

v is the final velocity

u is the initial velocity (which is 0 m/s since the car starts from rest)

t is the time taken to reach the final velocity

Plugging in the given values:

a = (46.2 m/s - 0 m/s) / 4.2 s

a = 46.2 m/s / 4.2 s

a = 11 m/s²

Thus, the blue car's acceleration is 11 m/s², which corresponds to option A.