Please Help ....It's Physcial Science?

Question

Here is my physcial science question:What is the speed of an 800-Kg car whose KE is 250 J?

Im confused, do you find the answer, or what is the formula, I'm confused...

Answer 1

ok, physics revolves around equations and the equation which links KE with mass is:

kinetic energy = 1/2 mass * (speed squared)

so substititute what you know into the formula

250 = 1/2 * 250 * (speed squared)

and then all you have to do is solve it, and I am sure you can manage that yourself.