Time remaining:
What is the car's mass?

Physics
Tutor: None Selected Time limit: 0 Hours

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, 2014

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

Are you studying on the go? Check out our FREE app and post questions on the fly!
Download on the
App Store
...
Oct 16th, 2014
...
Oct 16th, 2014
Dec 8th, 2016
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer