Question: 1. A particle is moving on the x-axis. It has velocity v(x) when it is at the point with coordinate x. Show that its acceleration at that point is v(x)v'(x).
2. If f is decreasing and f(20) = 10, which of the following must be incorrect?
(a) (f-1)'(20) = -3
(b) (f-1)'(10) = 12