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## Homework Statement

A boy trample everything he can on his tricycle and manages to briefly hold

speed 9 km / h on flat ground. When he stops pedaling cycle continues by itself 7.5m

bout it stops due to friction. The boy and the bike weighs together 21

kg. How large average power develops boy during the short time he keeps

fly 9 km / h.

## Homework Equations

kinetic energy = 0,5*m*v^2

## The Attempt at a Solution

kinetic energy = 0,5*m*v^2=0,5*21*2,5^2 = 66 Joule