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A car rolls gentley(Vo=0 m/s) off a vertical cliff. How long does it take for it to reach 100km/hr.

why cant i use V = Vo + at

where:

V= 100

Vo = 0

a = 9.8(gravity)

t = ?

the only equations ive been given to do this are:

V = Vo + at

V^2 = Vo^2 + 2ax

x=Vot + 1/2at^2

ARGGGGGHHHHHHHHHHHHHHHHHH!