10. A car starts from rest at a stop light and reaches 20 m/s in 3.5
s. Determine the acceleration of the car.
a) 2.2m/s2
b) 7.0m/s2
c) 5.7m/s2
d) 70m/s2

Suppose that f : rn → rm and that a ∈ k, where k is a connected subset of rn . suppose further that for each x ∈ k there exists a δx > 0 such that f(x) = f(y) for all y ∈ bδx (x). prove that f is constant on k; that is, f(x) = f(a) for all x ∈ k