Question

A 75 g Frisbee is thrown from a point 0.93 m above the ground with a speed of 14 m/s. When it has reached a height of 1.6 m, its speed is 11 m/s. What was the reduction in the mechanical energy of the Frisbee-Earth system because of air drag?

Answer 1

Here,

for the loss in mechanical energy

loss in mechanical energy = initial mechanical energy - initial mechanical energy

loss in mechanical energy = 0.50 * 0.075 * 14^2 + 0.075 * 9.8 * 0.93 - (0.50 * 0.075 * 11^2 + 0.075 * 9.8 * 1.6)

loss in mechanical energy = 2.32 J

the loss in mechanical energy is 2.32 J