2. Compare food energy(2500kcal per day) to KE of truck moving along road. The car weighs 4,000kg. How fast would it have to be moving to have KE equal to daily food energy?

we know KE = 1/2*(mass)*velocity^2 so i plug it in as 2500=1/2(4000kg)*v^2

2500/2000=1.25

take square root of 1.25 = 1.1180

but the correct answer given by my teacher is: Velocity = 72.3 m/sec i don't understand what im doing wrong??