A 90-kg skier slides down a frictionless ramp of snow at an initial height of 10 meters above ground level and a speed of 15 m/s, as shown in the diagram below: When the skier reaches the ground, they slide through a horizontal plane of 20 meters of unpacked snow that has some friction. If the skier travels at 12 m/s after sliding past the patch of unpacked snow, what is the magnitude of the unpacked snow's friction in newtons? Round to the nearest integer