Question

A race car starts at rest and speeds up to 40 m/s in a distance of 100 m. Determine the acceleration of the car.

Answer 1

Answer:

Acceleration of the car, $a=8\ m/s^2$

Explanation:

Given that,

Initial speed of the car, u = 0 (at rest)

Final speed of the car, v = 40 m/s

Distance covered, s = 100 m

We need to find the acceleration of the car. It can be calculated using third equation of motion as :

$v^2-u^2=2as$

a is the acceleration of the car

$a=\dfrac{v^2}{2s}$

$a=\dfrac{(40)^2}{2\times 100}$

$a=8\ m/s^2$

So, the acceleration of the car is $8\ m/s^2$. Hence, this is the required solution