# Heat and Kinetic Energy Question

## Homework Statement

Two cars collide as both are traveling at 90km/hr. What is the increase in temperature of the wrecks, assuming that the cars have c = 447 joules/kelvin.

## Homework Equations

Q= mc(change in T)

## The Attempt at a Solution

I found the joules of kinetic energy equal to 625 joules * mass of car (25 m/s speed = 625/2 joules of KE per car X two cars).
I then divided that by 447 for the c value, to get 1.4 K. But the answer is not correct?

Related Introductory Physics Homework Help News on Phys.org
LowlyPion
Homework Helper

## Homework Statement

Two cars collide as both are traveling at 90km/hr. What is the increase in temperature of the wrecks, assuming that the cars have c = 447 joules/kelvin.

## Homework Equations

Q= mc(change in T)

## The Attempt at a Solution

I found the joules of kinetic energy equal to 625 joules * mass of car (25 m/s speed = 625/2 joules of KE per car X two cars).
I then divided that by 447 for the c value, to get 1.4 K. But the answer is not correct?
Half of that would be correct though wouldn't it?

Don't you have to consider the total heat into the total mass?