# Physics 11

posted by Kayla

In the absence of air resistance, a ball of mass m is tossed upward to reach a height of 20m. Given that Fg=mg, what is the net force on the ball at the 10m position (half way up)?
a)2mg b)mg c)mg/4 d)mg/2

I already got this wrong bc I had no idea how to solve. I have a midterm coming up & I'm worried about a similar question, can someone show me step by step how I should have solved for that?

Thanks a ton!! :)

1. bobpursley

the net force on the ball is only from gravity, mg. Remember, even half way upwards, it is still accelerating downward due to the force of gravity.

2. Scott

the ball is in free fall with no air resistance

gravity is the only force on the ball

net force is ... m g

3. Kayla

Ok, so then is it fair to say that when Fapp releases an object in the air or on a horizontal surface Fnet= the opposing force?

Thanks :)

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