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Example 11.4 What is the work to be doneto increase the velocity of a car from30 km h-1 to 60 km h-' if the mass ofthe car is 1500 kg?

Answer»

Work = Change in kinetic energy= 0.5 m (v² - u²)= 0.5 × 1500 kg × [(60 × 5/18 m/s)² - (30 × 5/18 m/s)²]= 156250 joules= 156.25 kJ

Work done is 156.25 kJ



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