1.

What is the work to be doneto increase the velocity of a car from30 km h1 to 60 km h1 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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