The problem involves calculating the mass of a car based on its change in kinetic energy as it accelerates from 18 m/s to 35 m/s, with a given change in kinetic energy of 154 kJ. The subject area pertains to mechanics, specifically kinetic energy and momentum.
The discussion is active, with participants attempting to clarify the correct equations to use and how they relate to the problem at hand. Some have suggested constructing an equation that connects change in kinetic energy to mass, while others have pointed out missing components in their formulations.
Participants are navigating through the implications of the equations provided and the assumptions underlying the definitions of kinetic energy and momentum. There is a focus on ensuring all necessary factors are included in their calculations.
Marts12 said:KE = 0.5mv^2
Kinetic energy = change in momentum = mv2-mv1
Yes, and you already have all the ingredients to construct that equation yourself.Marts12 said:KE=0.5mv^2 is the correct equation for kinetic energy, but we are given that.
Am I right in saying that I need an equation that relates the change in Kinetic energy to mass?
Nearly, but you lost the 1/2.Marts12 said:Ok,
If I were to say that Change in Kinetic Energy = mv2^2 - mv1^2
Where v2 = final velocity and
V1 = initial velocity
Would I be on the right lines?