What classifications did Cocaine fill into?

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?

Why does gravity have a lesser than grater effect on higher altitudes?