With the X Axis Horizontal and the Y Axis Vertically

Multiple Choice

With the x axis horizontal and the y axis vertically upward, the change in the horizontal component of velocity, Δv_x, and the change in the vertical component of velocity, Δv_y, of a projectile are related to the time since leaving the barrel, Δt, as

A) Δv_x = 0; Δv_y = 0.
B) Δv_x = gΔt; Δv_y = 0.
C) Δv_x = 0; Δv_y = gΔt.
D) Δv_x = 0; Δv_y = −gΔt.
E) Δv_x= gΔt; Δv_y = −gΔt.