This part of the plane lies above a triangle with boundaries 
and 
along the coordinate axes, as well as the line
When , we have 
. So this triangle is the set
Also, when , we have 
. So the triangle has length 3 and width 5, hence area 1/2•3•5 = 15/2.
Let 
. Then the area of the plane over 
is
We have
since the integral
is exactly the area of , 15/2.
Friction is a force. A resistance force that tries to slow down and stop objects in motion. The difference between friction and air resistance is that friction acts on surfaces. For example, if I were skateboarding on a rough surface, more friction would occur so I would travel slower. If I were skareboarding on ice, I would go faster because there is much less friction to slow me down. Hope that helps:)
Answer:
The rate at which work is done is power
