Answer : 168 Newtons.
Explanation : At first when Sully is riding a snowmobile on a flat, snow covered surface with the constant velocity of 10 meters/second, the total mass is 280 Kg;
When sully accelerates to velocity of 16 meters/second over 10 seconds.
The net change in constant velocity will be 16 - 10 = 6;
Therefore, net acceleration will be the ratio of change in velocity by time;
6 / 10 = 0. 6 meters/second.
Using the given formula for finding the force will be F = ma
Here, m = 280 Kg a = 0.6
Therefore, Force = 280 X 0.6 = 168 Newtons.
So, the force exerted by the snowmobile to accelerate will be 168 Newtons.