Question

How much work should be done on a bicycle of mass 30kg to increase its speed from 2m/s to 5 m/s?

Answer 1

`Phi = 315 J`

Explanation:

`Phi = triangleK_e`
`Phi` = Work
`K_e` = Kinetic Energy
`Phi = (30 * 5^2)/2 - (30 * 2^2) / 2`
`Phi = (15 * 25) - (15 * 4)`
`Phi = 375 - 60 = 315 J`