A particle moves along the curve y = e2x such that its velocity has a constant magnitude of v=4ft/s. Determine the x and y components of velocity when the particle is at y=5ft.
a) vx = 1ft/s, vy =4ft/s
b) vx = 2ft/s, vy =8ft/s
c) vx = 4ft/s, vy =1ft/s
d) vx = 8ft/s, vy =2ft/s