Question

At what speed should a ball of mass 2 kg travel so that it has kinetic energy of 500 J

Answer 1

Answer:

we use the equation

kinetic energy (Ek)=1/2*mv²

when we rearrange the equation we get speed (v) as

root of 2Ek/m=speed

so root of 2(500)/2=10 root 5m/s or 22.36m/s

Answer 2

Answer:

k=250,000

Explanation:

k=1/2m v^2

k=1/2(2)(500 J)=

250,000