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Question

Find the average force needed to accelerate a car weighing 500 kg from rest to 72 km/h through a distance of 25 m.

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Solution

Given: Mass of the car, m=500 kgInitial velocity of the car, u=0Final velocity of the car, ν=72 km/h=20 m/sa=ν2-u22sa=40050=8 m/s2

Force needed to accelerate the car,
F=ma=500×8=400N

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