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What happens when a person pulls upward on the box as shown with a force
equal to, or greater than the box's weight?
Let Fp = 100.0 N rather than 40.0 N as shown.

The object will have an upward acceleration

Explanation:

Let's consider the forces applied on the box. We have only two forces:

- The applied force of push, , downward

- The force of gravity, , (also known as weight of the object), downward

Therefore, the net force on the box is:

Here, we know that force applied is equal or greater than the weight, so

And therefore the net force is greater than zero:

(1)

According to Newton's second law of motion, the net force on the box is equal to the product between its mass and its acceleration:

where

m is the mass of the box

a is its acceleration

Given (1), this means that

Therefore, the box will have an upward acceleration.

In this case force example we have:

So the mass of the box is

So the net force is

And the acceleration is

the answer is a)

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