PH-1348

Resultant force and F = ma

Physics · Secondary 4 · Hard · Resultant force and F = ma

A car of mass 900 kg is travelling at a speed of 20 m/s. The driver brakes and the car comes to rest in 5.0 s. Assuming the braking force is constant, what is the magnitude of the resultant braking force on the car?

Use Newton’s second law.

$3.6 \times 10^3\,\text{N}$
$1.8 \times 10^3\,\text{N}$
$4.5 \times 10^3\,\text{N}$
$9.0 \times 10^3\,\text{N}$

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