- #1

physical..O.o

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## Homework Statement

Hi, VERY URGENT and im so confused

Find the efficiency of the optimum trebuchet.

Optimum trebuchet Specs:

Counterweight= 5kg

Sling Length= 78cm (laid out fully)

Length from fulcrum to load= 44cm

Length from fulcrum to counterweight=16cm

Height the weight drops when fired = 29.632cm

Average range = 23.7733

Weight of projectile = 46g

Gravity = -9.8

## Homework Equations

KE= 1/2 mv^2 (no idea what to use this for and when, apparently we needed to, this is why i am so confused. what has it got to do with this?)

Actual measured range/ (2*(counterweight mass*distance the counterweight falls)/mass of projectile)

(Force(load)*Distance (load))/( Force(effort)*Distance(effort))

F=Ma

## The Attempt at a Solution

23.7733/ (2*(5*0.29632)/0.046)

= 0.369*100

= 36.9%

OR

(0.046*-9.8*0.44)/(5*-9.8*0.16)

=0.0253

=2.53 %

im so confused