Question

A car accelerates from rest to 30 m/s in 4.2 s. What is the car's acceleration?

Answer 1

In order to find the car's acceleration, we need to list the following:

• Initial Velocity
• Final Velocity

• Time

The initial velocity is going to be zero since the car is accelerating from rest.

Initial velocity = 0 m/s

The final velocity is going to be 30m/s.

Final velocity = 30 m/s

The time is 4.2s.

The formula for acceleration is:

$a=\frac{Finalvelocity-InitialVelocity}{Time}$

$\frac{30-0}{4.2} =7.14..$

That will be the car's acceleration.