Mar 6th 2017, 08:29 AM
Join Date: Mar 2017
Calculating final kinetic energy from change in velocity by percent
The kinetic energy of a car is 1.02 × 105 J. If the car s speed increases by 28.2%, then what is the new kinetic energy of the car?
I set up the ratio Kf/Ki=Vf2/Vi2
Vf= 1 + 28.2/100)2Vi2
this cancels the right side of the equation out to (1.282)2
to find Kf, I then multiplied both sides by Ki, making the left side (1.282)2X10,200
this means Kf=16764J
Why is this incorrect?
Last edited by pmt; Mar 6th 2017 at 09:03 AM.