-LED= .02Amps
-Gravity is 9.8m/s^2
-Not accounting for wind or other resistance
- Dropping weight from 2 meters
-Powered by 9V battery
1. How many Joules to needed to power for 30 minutes
Watts= J/s
.02A*9V=.18 Watts
.18W=J/(30min*60sec)
.18W=J/1800s
J=324
2. How much weight to create 324 J work
J=kg(m/s^2)
324=mass((9.8m/s^2)*2m)
mass=16.5kg
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