A wooden block with mass m is still on a smooth horizontal ground. Starting from t = 0, a horizontal constant force with size f is applied on the wooden block. At t = T1, the power of force F is the answer. How to calculate f ^ 2 / m * t?

f=ma,a=f/m,
t=t1,v=at=f/mt1
p=fv=f*f/mt1=f^2/mt1

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