From the information given , Brandon and the skateboard have a combined mass of 100kg, and the net force that is applied to them is 100 N.
We use the formula: F = m × v.
Where F= force, m = mass and v = velocity.
In our case F = 100 N and m = 100kg. We need to find v so we rearrange the equation: F = m × v → F/m = v (or v = F / m)
v = F/m → v = 100/ 100 → v = 1
Therefore he will accelerate to 1 m/s.