The average frictional force on a 1.5 N(weight) falling ball is 0.2 N. What net force is acting on the ball after being dropped? What is the kinetic energy just before hitting the ground? What mechanical energy is lost?

Question

anonymous · Answer

i think the frictional force is lost at last

cj7529 · Answer

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so add the vectors.
The force of gravity will counteract the frictional force and it will accelerate down.

kinetic energy = (mv^2)/2 =mgh
You need to know the height the ball was dropped from to get the kinetic energy though, isn't there anymore info in the question???

anonymous · Answer

Oh yeah sorry. The height the ball was dropped from is 4 meters.