(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I have worked out at problem using the conservation of mechanical energy and the answer is correct.

I have also worked out the problem using kinematics and got the same answer.

My problem is that I can't wrap my brain around why it works out using the conservation of mechanical energy.

Here is a statement of the problem (a graphic is attached as well with my solutions and some questions):

"A motorcyclist is trying to leap across the canyon by driving horizontally off the cliff. When it leaves the cliff, the cycle has a speed of 38.0 m/s. Ignoring air resistance what is the speed when the driver strikes the ground on the other side?"

2. Relevant equations

1/2mvi^2 + mghi = 1/2mvf^2 + mghf

vf^2 = vi^2 + 2gd

3. The attempt at a solution

Please see attached w/ my included questions.

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

Join Physics Forums Today!

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

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

# Work-Energy vs. Kinematics

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