how much force is needed to accelerate a 66 kg skier at 2 m/sec
You are not given acceleration m/s is a velocity NOT an acceleration.
So perhaps the acceleration is 0 in which case the net force is 0 etc etc etc.
Here is the formula that I learned for this type of equation: \(F=M x A\) Force=Mass x Acceleration.
To solve this just multiply Mass (66kg) by Acceleration (2m/s) which equals 132 Newtons (N).