ok ive just cracked the ****s, for this question:(adsbygoogle = window.adsbygoogle || []).push({});

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!

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Kinematics in one dimension

**Physics Forums | Science Articles, Homework Help, Discussion**