Question 52
Since the velocity of the mass is constant at this time, all of the power applied is going into increasing the potential energy of the mass. Therefore $Power=\frac{Energy}{Time}=\frac{mgh}{t}=mgv=20\times10\times\ 0.5=100W$. Note that the gradient of the graph is the velocity of the mass.
Since the velocity of the mass is constant at this time, all of the power applied is going into increasing the potential energy of the mass. Therefore $Power=\frac{Energy}{Time}=\frac{mgh}{t}=mgv=20\times10\times\ 0.5=100W$. Note that the gradient of the graph is the velocity of the mass.