PH-2479

Work done

Physics · Secondary 4 · Hard · Work done

A car of mass 900 kg is travelling at a speed of 20 m/s. It brakes uniformly to a stop in 5.0 s. Using the work–energy principle, what is the average braking force on the car?

$1.8\times10^3\,\text{N}$
$3.6\times10^3\,\text{N}$
$9.0\times10^3\,\text{N}$
$1.8\times10^4\,\text{N}$

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