A student constructs a small sailboat a wind machine is able to blow air at a constant applied force of 5,10,15,20 newton. The student places the boat in a large tank filled with water and tests each wind force setting on the machine. Which wind force will result in the boat having the greatest speed?

answer: point c: b. 1/2 potential, 1/2 kinetic, point a: 3/4 of its potential energy, point d or b: 3/4 potential, 1/4 kinetic

explanation: i cant explain. it's difficult to explain.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

i will answer your question if you answer mine