physics
posted by Janie .
Jason drives due west with a speed of 55.0km/hr for 30.0 min, then continues in the same direction with a speed of 95.0km/hr for 2.00 hr, then drives farther west at 40.0km/hr for 10.0 min. What is the magnitude of Jason's average velocity

Some sliding rocks approach the base of a hill with a speed of 16.0 m/s. The hill rises at 38.0^\circ above the horizontal and has coefficients of kinetic and static friction of 0.400 and 0.620, respectively, with these rocks. Start each part of your solution to this problem with a freebody diagram.
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