Due to the principle of conservation of energy, the work done by the engine to move the scooter converts into kinetic energy of the scooter:
[tex]W=K= \frac{1}{2} M v^2 [/tex]
where M is the combined mass of scooter and rider, and v is the velocity of the scooter. Therefore, we can find the velocity as:
[tex]v= \sqrt{ \frac{2W}{M} } = \sqrt{ \frac{2\cdot 2700 J}{150 Kg} }=6 m/s[/tex]
