A student uses a pencil as a lever to launch a piece of trash into the trashcan. If the student positions a marker as the fulcrum just 2.8 cm from where she applies effort, and 7 cm from the piece of trash to the fulcrum, what is the mechanical advantage the lever gives?

Formulas:
Mechanical advantage = effort distance/resistance distance
Mechanical advantage = resistance force/effort force
Work = force × distance

Your

A) .4

B) 2.5

C) 4.2

D) 19.6

no. dot product   =0 when vecs at right angles

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