- #1

gungo

- 27

- 1

## Homework Statement

Students used a speed gun to measure the final speed of slider at the bottom of the slide. They measure the height difference between the top and bottom of the slide to be 3.0 m.

If the speed of a slider at the bottom of the slide is 5.0 m/s, what is the efficiency of the energy transformation?

## Homework Equations

mgh1+1/2mv^2=mgh2+1/2mv^2

efficiency=Eout/Ein x100

## The Attempt at a Solution

the masses of :mgh1+1/2mv1^2=mgh2+1/2mv2^2 cancel out, so I'm left with

gh1+1/2v^2=gh+1/2v^2

3(9.8)+1/2v1^2=1/2(5)^2

When I isolate v1^2, I get a negative number which wouldn't work because I can't get the square root of it to find v. But after finding v, what would I do?