## College Physics (4th Edition)

(a) The instantaneous power is $8800~Watts$ (b) The instantaneous power is $6400~Watts$
(a) In general: $Power = F~v$ From the graph, we can see that the force is $800~N$ when the velocity is $11~m/s$. We can find the power: $Power = (800~N)(11~m/s) = 8800~Watts$ The instantaneous power is $8800~Watts$ (b) From the graph, we can see that the force is $400~N$ when the velocity is $16~m/s$. We can find the power: $Power = (400~N)(16~m/s) = 6400~Watts$ The instantaneous power is $6400~Watts$.