You're very close! The provided information is correct, but there's a slight mistake in how the acceleration is expressed. It should be 5 m/s² (meters per second squared).

Here's how to calculate the mass:

Newton's Second Law of Motion:

* F = ma

* F = Force (Newtons, N)

* m = Mass (kilograms, kg)

* a = Acceleration (meters per second squared, m/s²)

Solving for Mass:

1. Rearrange the equation: m = F / a

2. Plug in the values: m = 100 N / 5 m/s²

3. Calculate: m = 20 kg

Therefore, the mass is 20 kilograms.