Increase mechanical advantage?

Question

Which would increase mechanical advantage?

increasing the length of a ramp

greasing a surface of a ramp

rolling a heavier ball down a ramp

none of the above

Answer 1

ummm, potential energy is based on height, or how high the ball starts rolling from. you say elongating the ramp, if you dont start from a higher point (like just decreasing the angle while making ramp longer), i dont think any of those things increases the PE. but you are asking about Mechanical advantage. i havent a clue what you mean

Answer 2

none of the above

Answer 3

Increase the length of ramp.

Answer 4

I believe the first one is correct.

Answer 5

a