1.

xample 11.4 What is the work to be doto increase the velocity of a car fr30 km h1 to 60 km h- if the massthe car is 1500 kg?olution:

Answer»

for velocity to be changed from 30km/h , to 60km/h change the velocity in m/s

30km/h = 30*5/18 = 25/3 m/s and 60km/h = (50/3) m/s

the work done = change in K.E

w = 1/2*m*((50/3)²-(25/3)²) = 1/2*(1500)*(2500-625)/9 = 156250J = 156.25 KJ



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