1.
7. A projectile is fired upward at 30° to the horizontal. What do we know about the horizontal
component of the velocity if air resistance is neglected? A) It increases, then decreases C) It
increase at a constant rate. B) It decreases at a constant rate. D) It remains constant
Solution
when a projectile is fired from ground at an angle 30 o
to the horizontal the horizontal component
of the velocity remains consatant because there will be no acceleration in the horizontal direction
hence there is no change in the velocity
takimg the equation of motion
v = v o + a t
since a = 0
v = v o
hence (D) is the correct option