Question

A 1,000 kg car has 50,000 joules of kinetic energy what is its speed??

Answer 1

Using KE=1/2mv^2

v=$\sqrt{50000/500$

so v=10

Answer 2

½mv²= KE  

½(1000)?²= 50000

500*?²= 50000

/500            /500

? ²=100

Square root  

?= 10

10 m/s is you answer