A10.0 kilogram mass of iron on earth exerts a downward force of 98 newtons. on the moon this same 10.0 kilograms of iron is weighed and found to exert a downward force 16.3 newtons. how is this possible ?

The decrease in the downward force that a mass of iron can exert on the moon versus the force it exerts on earth is due to:

Explanation:

To recognize the calculation within the statement, you must know that the Newton unit is equal to:

And that the gravities of the Earth and the Moon are:

Finally, you must know the force formula (since we are talking about a descending force):

Since the mass in both cases is the same (10 kilograms), the variation in acceleration will provide different values of descending force, as shown below, replacing the values:

As you can see, when it comes to force, the less acceleration (in this case less gravity), the lower the downward force will be with a mass of equal weight.

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.