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What is the car's mass?

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It takes 140 kJ of work to accelerate a car from 23.5 m/s to 30.0 m/s. What is the car's mass? 

Oct 16th, 2017

the change in kinetic energy is to be equal to the work done. 

so to work out the change in kinetic  energy we find out the kinetic energy at start and the kinetic energy at the end and then work out the difference between them so: 

0.5*m*(30^2-23.5^2) so therefore 170m=140*10^3 J 

therefore m = 823.52kg 

Oct 16th, 2014

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