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Step by step explanation:
It is given that:
Mass of car = 100 kg
Two passengers with each of a mass of 50 kg
Initial velocity = 60 km/h
Car takes 5 s to stop
Force = mass*deceleration
Acceleration = (final velocity - initial velocity)/time
Initial velocity = 60 km/h = 60*\frac{1000}{60*60}=16.666\:m/s
acceleration = (0-16.666)/5 = -3.333\:m/s^2
Therefore, the deceleration = 3.333\:m/s^2
Total mass = mass of car + 2(mass of passenger) = 100+2(50) = 200 kg
Therefore, force = 200*3.333 = 666.66 N
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