Question

Calculate the amount of work needed to stop a car of 500 kg, moving at a speed of 36 km/h.

Answer 1

Answer:

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Explanation:

Mass of the car m = 500 kg

Initial speed u = 36 km/h = 10 m/s

Final speed v = 0

s = 150 m

We have v2 - u2 = 2as

a = (v² - u²)/(2s)

= (0 - 10²)/300 = -100/300 = - 0.33 m/s²

Retardation = 0.33 m/s²

Force applied by the brakes = Retarding force F = mass x retardation = 500 x 0.33 = 165 N.

Work done before stopping W = Force x distance moved = 165x 150 = 24750 Nm = 24750 J

Answer 2

Explanation:

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