What can be done to improve the efficiency of a ramp?
A. Smooth the surface.
B. Add a rough surface.
C. Insulate the surface with foam.
D. Make it shorter and steeper.
1 answer
A. Smooth the surface.
A. Smooth the surface.
B. Add a rough surface.
C. Insulate the surface with foam.
D. Make it shorter and steeper.
1 answer