Originally Posted by
Louisana1 If a 75-kg sprinter can accelerate from 0.3 m/s to a speed of 10 m/s in 2 s, what average power is generated?
a. What is the Change in Kinetic Energy of the sprinter?
b. What is the WORK DONE by the sprinter?
c. How much power is does the sprinter generate during this process?
Need help with these equation
The unit of power is Watt (Joule/second).
The initial kinetic energy is
E_ki = mv^2/2 => E_ki = 75*0.3^2/2
The final kinetic energy is
E_kf = mv^2/2 => E_kf = 75*10^2/2
The change in kinetic energy is then
E_kf-E_ki = ...
The work done by the sprinter is the same as the energy turnover (is that correct English?)
We then have that the sprinter generates a power equal to the difference in kinetic energy over a period of time, in this case 2 seconds.