As ocean waves approach shore, their velocity decreases. how does a decrease in velocity affect the frequency and wavelength of the waves entering the shallow water?
a.
frequency increases and wavelength decreases
b.
frequency decreases and wavelength increases
c.
frequency stays the same and wavelength increases
d.
frequency stays the same and wavelength decreases

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".