It takes 140 kJ of work to accelerate a car from 23.5 m/s to 30.0 m/s. What is the car's mass?
140 kj =140000 newton-metre
acceleration = 30 -23.5 = 6.5 m/s^2
Applying Newton's second law of motion
F =mass x acceleration
140000 = mass x 6.5
mass= 140000/6.5 = 21538 kg
Mass of car = 21538 kg
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