Question

A 1110 kg car moving at 21 m/s East is struck by a truck traveling West. The truck's impact exerts a force of -8000 kg•m/s2 for 0.90 seconds. Calculate the car's final velocity.

Answer 1

Answer:

v = 15.23 m/s

Explanation:

Given that,

Mass of a car, m = 1110 kg

Initial velocity, u = 21 m/s

Force,F = -8000 N

Time, t = 0.9 s

We need to find the final velocity of the car.

Force, F = ma

$F=\dfrac{m(v-u)}{t}\\\\v-u=\dfrac{Ft}{m}\\\\v=\dfrac{Ft}{m}+u\\\\v=\dfrac{-8000\times 0.8}{1110}+21\\\\v=15.23\ m/s$

So, the final velocity of the car is 15.23 m/s.