Question

Calculate the kinetic energy possessed by a car of mass$400kg$ moving with a velocity of$12m/s$.

Answer 1

Step 1 Given data,

1. Mass,$m=400kg$
2. Velocity$,v=12m/s$.

Step 2 Formula used,

Kinetic Energy, (K E) = $\frac{1}{2}m{v}^2$

Step 3 Solution,

$$\begin{gathered} =\frac{1}{2}\times 400\times 12\times 12 \\ =200\times 144 \\ =28800J \\ 1kJ=1000J \\ =28.8KJ \end{gathered}$$

Hence, the kinetic energy of moving car is $28.8KJ$