A girl of mass 40kg climbs a rope 8m long at a constant speed in 15s . WhT power does she expand against gravitational forces during the climbs ? I saw that the answer is 213.33
But the Dr. said it’s -213.33 according to ( final h- initial h)
So ... I don’t know what is the right answer
Plz help

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.

C. the electric current passes from the slip rings, through the brushes, and to the collection device.

You need to calculate the string in between two masses