Q1 of 101 Page 132

The mass of cyclist together with the bike is 90 kg. Calculate the increase in kinetic energy if the speed increases from 60 km/h to 12 km/h.

Given initial speed =6000kmph = 5/3 m/sec So the K.E = Now the final speed = 12kmph = 10/3 m/sec So the K.E = Therefore the increase in K.E = 500-125=375Joules


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