Question

A 1000 KG car has 50,000 joules of kinetic energy. What is the speed?

Answer 1

KE=1/2mv^2
50000=(0.5)(1000)v^2
v^2=50000/500
v^2=100
v=10 ms^-1

Answer 2

Answer:

½mv²= KE  

½(1000)?²= 50000

500*?²= 50000

500          500

? ²=100

Square root  

?= 10

10 m/s is you answer