Question

what force is required to bring a 900g car to
rest from
a speed of 120km/hr
within a distance
of 50m?

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Answer 1

The answer is 10 N

u=120km/hr = 100/3 m/s

v=0m/s

s=50m

v^2 - u^2 = 2as

0 - 100 * 100 / 3*3*2*50 = a

a = 100/9 m/s^2

F = mass x acceleration

= 0.9 kg * 100/9 m/s^2

= 10 N

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