With the x axis horizontal and the y axis vertically upward, the change in the horizontal component of velocity, ?vx, and the change in the vertical component of velocity, ?vy, of a projectile are related to the time since leaving the barrel, ?t, as
A. ?vx = 0; ?vy = 0.
B. ?vx = g?t; ?vy = 0.
C. ?vx = 0; ?vy = g?t.
D. ?vx = 0; ?vy = ?g?t.
E. ?vx = g?t; ?vy = ?g?t.
Answer: D
Physics & Space Science
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