Question

What is the work to be done to increase the velocity of a car from 30 km/hr to 60km/hr if the mass of the car is 1500kg?

Answer 1

Given mass = 1500kg.

Given   u = 30km/hr

                = 30 * (5/18)

                = 25/3


Given  v = 60km/hr

               = 60 * (5/18)

               = 50/3


We know that Work done = 1/2 * m(v^2 - u^2)

                                            = 0.5 * 1500 * (2500/9 - 625/9)

                                           = 0.5 * 1500 * 208.333

                                           = 156250 J

                                           = 156.25KJ.


Hope this helps!

Answer 2

plzz refer the attachment

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