- #1

ladymiresa

- 4

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## Homework Statement

A motorcyclist must cross a ravine. The far side of the ravine is 2.0 meters higher than the launch point, a ramp that makes an angle of 40◦ with the horizontal. If the ravine is 10.0 meters wide, what minimum speed v must the biker have when leaving the ramp to successfully cross the ravine? Take the launch point at the end of the ramp as the coordinate origin.

## Homework Equations

yf=yi+(vi)t-.5g(t^2)

## The Attempt at a Solution

Well, I know that Vxi=vicos40 and vyi=visin40.

Known: xi=0, yi=0, ti=0, xf=10, yf=2, theta=40, ay=-9.8

I want to use to equation above, but I can't because I know neither the Vi nor the T. I thought I could figure out the T by saying that the initial vy was zero, but that definitely doesn't seem right because then only gravity would be acting on the bike and he has to GAIN 2m in height. So I'm a little stuck. I'd really appreciate any tips to help me figure out this problem!