Consider the skier on a slope with an tilting angle of 48.0. Her mass including equipment is 66.5 kg. What is her acceleration in unit of m/s if friction coefficient between her and the slope is 0.2? Consider the skier on a slope with an tilting angle of 52.9. Her mass including equipment is 78.9 kg. What is friction coefficient between her and the slope, if her acceleration is 9.932 m/s? Consider the skier on a slope with an tilting angle of 60. Her mass including equipment is 80.1 kg. What is the kinetic frictional force exerted on her by the slope if she is moving down the slope with a constant velocity?