physics homework help?

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If a car rolls gently (Vo=0) off a vertical cliff, how long does it take it to reach 90 Km/h? Please tell me what equations to use for this problem.

2007-09-01 09:07:44 · 2 answers · asked by LilChineseFob 1 in Science & Mathematics ➔ Mathematics

the answer on the back of the book says 2.6s... so can someone gimme the equation and a step by step thing on how to solve it.

2007-09-01 09:32:22 · update #1

v= gt+vo as vo =0
t=90,000/(3600*9.8)=2.55 s ( be careful with the physical units)

2007-09-02 02:44:52 · answer #1 · answered by santmann2002 7 · 0⤊ 0⤋

well acceleration due to gravity (g) = 9.81
so s= 1/2 a t squared

2007-09-01 16:17:34 · answer #2 · answered by lukeh466 3 · 0⤊ 0⤋