Calc Energy to Take 1,112kg Car 1.2km Up Mtn: 3SF

[Hannah1]

Homework Statement

What is the energy needed to take a 1,112 kg car to 1.2 km up a mountain? Write your answer to 3 significant figures.

Homework Equations

PE = KE
PE = mgh
KE = ½mv²
mgh = ½mv²
1 km = 1000 m

The Attempt at a Solution

h = 1.2 km = 1200 m
PE = mgh = (1112)(9.8)(1200) = 13077120
PE = KE
Energy = 13077120 Joules

I don't think my answer is correct because it says to write my answer to 3 significant figures.
Where did I go wrong?

 

[SSJ2]

dont forget...when dealing with large numbers its best to include as many sig figs in your calculations as possible, use 9.81 instead of 9.8 and you will get something that you can round to 1.31E7 J

 

[Hannah1]

dont forget...when dealing with large numbers its best to include as many sig figs in your calculations as possible, use 9.81 instead of 9.8 and you will get something that you can round to 1.31E7 J

(1112)(9.81)(1200) = 13090464
13090464 = 1.31E7

Energy = 1.31E7 Joules

So, is that the answer?