- #1
rupz28
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Homework Statement
You slam on the brakes and begin decelerating at 20,000 km/h2! The curve sign said you have to be down to 80 km/h before you hit the curve or you'll go over the cliff. You have 10 seconds until you reach the curve. Is your final velocity going to be down to 80 km/h by the time you reach the curve?
The current speed is 180.7 km/hr
Homework Equations
If a = fv-sv/t then solving for final velocity is fv = a(t) + sv
The Attempt at a Solution
divide the number of seconds by 3600 to get the number of hours = 0.002hr
fv = -20,000 km/h2(0.002h) + 180.7 km/h
= 140.7km/h or is it 140.7 km/h2
Homework Statement
So, you go over the edge. This is it, you are dead! The cliff you just fell off is 3000m high. At gravity's 9.8 m/s2 acceleration, how many seconds do you have until you meet your doom?
Homework Equations
a= d/t2
The Attempt at a Solution
d = 3000m
a = 9.8 m/s2
I guess need to isolate t2 first, to get t2 = d/a, so t2 = 3000m/9.8m/s2
3000m/9.8m/s2 = 306 seconds? this doesn't seem correct, seems like it would take too long to hit the bottom
Thanks for all help