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## Homework Statement

What is the force needed to accelerate a 2.0kg ball at 3.0ms^-2

a) In a frictionless horizontal surface, near the surface of the Earth

b) Vertically upward, near surface of the Earth

## Homework Equations

f=ma

w=mg

## The Attempt at a Solution

For a) F=2(3) = 6N

By inputing the variables into the formula, I got to an answer. but, I do not know how a) differs from b), as in what route to do for b...

Thank you for any help. :-)