Help calculating force needed for VectorForce

I need help calculating the force I need to achieve a desired velocity using a VectorForce for a boat I’m making. I’m aware that LinearVelocity exists which allows me to input the velocity I want and has the ability to vary the force needed automatically, but it has a caveat which is that the boat reaches the velocity almost instantaneously. Using a VectorForce solves this problem, but at a cost of a reduced velocity than desired, most likely due to friction between the boat and the water terrain

Physics formulas I’m currently using to calculate the force I need (I’m using metric units but the formulas are easy to convert to Roblox units):
N = kg * m/s² which is equivalent to: N = kg * (m/s / s)
N = force
m = meter
s = second

Essentially a tldr is: I need a way to add friction to the force calculation I’m using so that the boat reaches the speed I desire

Since it’s been almost a day now without a reply, I’ll bump this by adding more info:

At the moment my boat is just 1 Part welded to a VehicleSeat. The VehicleSeat is massless while the boat part has a mass of 18.9 RMU (Roblox mass units). I would like my boat to travel at a speed of 16 studs/second and take 1 second to accelerate to the speed, so I used the formula in the main post to calculate the force I need which in this case is 302.4, but setting the VectorForce to that value results a speed of approx. 6.5 studs/second instead, most likely due to friction between the boat part and the water terrain which I’m having trouble incorporating to my calculations