physics

What are the speed and acceleration (increase/decrease or remain constant) of a ball rolling down a

a) straight hill,

b) concave hill

c) convex hill

Can someone explain why they are, not just the answers?

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  1. I am sorry, I do not get it.
    concave or convex or straight if a tangent to the slope slopes down there will be an acceleration down and the velocity will increase.

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