4. A sled is pulled horizontally across the snow at constant velocity. The pulling force is 40 N. (Remember: Constant velocity means zero external forces)
a. What is the kinetic Frictional Force on the Sled?
b. if the weight of the sled is 200 N, what is the co-efficient of Kinetic Friction (us) between
the sled and snow?
c. If wood, weighing 300 N is placed in the sled, what pulling force is needed to move the
sled at constant velocity?

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped

How does an observation about an object differ from an inference about that object

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.