Question

 A car travelling at 20 m/s collides with a stationary lorry and is brought to rest in just 0.02s, Calculate the deceleration of the car.

Answer 1

We can find the deceleration of the car from the formula:

$$a=\dfrac{v-v_0}{t},$$ $$a=\dfrac{0-20\ \dfrac{m}{s}}{0.02\ s}=-1000\ \dfrac{m}{s^2}.$$

Answer:

$a=-1000\ \dfrac{m}{s^2}.$