Question

A car of mass 1000 kg moving with velocity 72 km/h takes 4 seconds to stop after the brakes are applied. the force exerted by the brakes is

1.) +4500 N
2.) +5000 N
3.) -4500 N
4.) -5000 N
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Answer 1

Not sure about +/-. rest the answer is all correct.

Answer 2

Answer:

4) option

Explanation:

72m/s ×5/18= 20 m/s

v=u+at

20=0+4a

a=5m/s

f=ma

f=1000×5

f=5000N

force is applied backward so -5000N

I hope it helps you

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