1.

Suppose a car has 4000 J of kinetic energy. What will be its kinetic energy if the speed is doubled? What if the speed is tripled?

Answer»

Solution :When speed is doubled , KE will increase FOUR TIMES. Hence,
KE=4000 x 4 =16000 J or 16 kJ
When the speed is tripled, KE will become nine times. Hence,
KE=4000 x 9 = 36000 J or 36 kJ


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