A car of mass 1000 kg travels at 12 m/s on a horizontal and the resistance to motion is 500 N. Find (b) its kinetic energy.

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Solution

Step 1: Given data
Mass of the car is, $m = 1000 k g$
Velocity is, $v = 12 m / s$
Resistance (force) is, $F = 500 N$

Step 2: Calculating kinetic energy
Kinetic energy is given as,
$K E = \frac{1}{2} m v^{2}$
where, $m$ is mass and $v$ is velocity.
Substituting the known values, we get,
$K E = \frac{1}{2} \times 1000 k g \times {(12 m / s)}^{2} K E = \frac{1000 \times 144}{2} K E = 72000 K E = 7.2 \times 10^{4} J$

Therefore, kinetic energy is $7.2 \times 10^{4} J$ .

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