It seems like there's a small error in the question. Acceleration should be measured in meters per second *squared* (m/s²), not just meters per second (m/s).

Assuming the question meant to say "an acceleration of 5 m/s²", we can use Newton's Second Law of Motion to find the mass of the object.

Newton's Second Law of Motion: Force (F) = Mass (m) x Acceleration (a)

We know:

* F = 100 N (Newtons)

* a = 5 m/s²

We can rearrange the formula to solve for mass:

* m = F / a

Plugging in the values:

* m = 100 N / 5 m/s²

* m = 20 kg (kilograms)

Therefore, the object has a mass of 20 kg.