Question

What is the kinetic energy of a 1.4 kg discus with a speed of 22.5 m/s?

Answer 1

The answer would be 345 J

Answer 2

354.375 J

Explanation:

The formula to find kinetic energy is:

`(1)/(2)` × mass ×
`(Speed)^(2)`

Mass = 1.4 kg

Speed = 22.5m/s

So the kinetic energy will be:

`(1)/(2)` × 1.4 ×
`22.5^(2)`

=
`(1)/(2)` × 1.4 × 506.25

Kinetic energy= 354.375 joules