Question

science


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Answer 1

Answer:

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