Finding car mass from kinetic energy

[drumjunkie]

A car has the kinetic energy of 432000 Joules when traveling at a speed of 42 m/s.

What is its mass? (Kg)

I know that K.E. = (1/2)(Mass)(Velocity squared)

So the equation reads 432000 = (1/2)(42 squared)(M)
I got an answer of 150 but my online program told me it was wrong.

Help?
Do I need to convert units somewhere?

 

[turin]

A car has the kinetic energy of 432000 Joules when traveling at a speed of 42 m/s.

What is its mass? (Kg)

I got an answer of 150 but my online program told me it was wrong.

Do I need to convert units somewhere?

No. Everything is in SI units. I think you just made a typo in your calculator.

 

[aimslin22]

when I did it, I had an answer about 3 times bigger than yours. Perhaps check your math?