What is the relationship between the horizontal and vertical components of velocity for a projectile launched at an angle between 0° and 90°?
a.
each is independent of the other.
b.
each is dependent on the other.
c.
the horizontal component is dependent on gravitational acceleration.
d.
the horizontal component decreases with an increase in the vertical component.

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".