PH-2371

Work done

Physics · Secondary 4 · Medium · Work done

A car of mass 900 kg is travelling at a speed of 20 m/s. It brakes to a stop in a straight line. Using the kinetic energy formula, how much work is done by the braking force?

$1.8 \times 10^5\,\text{J}$
$3.6 \times 10^5\,\text{J}$
$9.0 \times 10^4\,\text{J}$
$4.5 \times 10^4\,\text{J}$

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