Question

A car's velocity changes from 0 m/s to 30 m/s, 10 seconds later. What is the car's acceleration?

a. -3m/s²
b. +0.3m/s²
c. -0.3m/s²
d. +3m/s²

Answer 1

d. +3m/s²

Step-by-step explanation:

`a = (v - u)/(t)`

Where v is the final velocity and u the initial velocity.

The final velocity would be 30m/s and initial velocity 0m/s

Time is 10 secs

`a = (30 -0 )/(10 ) \\ = (30)/(10) \\ = 3`

Therefore the acceleration is +3m/s²