Question

A footballer kicks a football of mass 430 g and it flies off at a speed of 8 m/s. What is the KE of the football?

Answer 1

13.76 Joules

Step-by-step explanation:

The SI units for joules are defined to be kilogram*meters per second. Therefore, we must turn the grams to kilograms by dividing the answer by 1,000. This is due to 1,000 grams being in a single kilogram. Kinetic energy is defined to be:

`KE=(1)/(2) mv^2`

Therefore:

`KE=(1)/(2) (0.43kg)(8m/s)^2=13.76J`