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.
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