Question

A 0.2 kg sponge is dropped from rest , pulled down by gravity. How fast will it be traveling in 6.0s , if a 0.5 N force of air resistance acts on it

Answer 1

weight = .2 * 9.81 = 1.96N
drag = .5N

net downward force = 1.46N
f = ma
a = 1.46/.2 = 7.3
v = at = 7.3 * 6 = 43.8 m/s

Answer 2

21