A 50. g pendulum swinging back and forth has a speed of 3.0 m/s at a height of 0.30 m. Determine the total mechanical energy of the pendulum.

370 J

220 J

0.22 J

0.37 J

The answer is D 0.37 J

convert 50 g to kg and you get. 05 kg

the total mechanical energy is kinetic energy plus the potential energy.

so Etotal=1/2mv^2+mgh

Etotal=1/2 * (.05kg) * (3.0m/s) ^2 + (.05kg) * (9.8m/s^2) * (0.30m)

Etotal=0.37 J