A sled (with skis on snow) is being pulled by a child with a rope. The child is being pulled with 50 N of force, and the rope makes an angle of 30 degrees with the horizontal. The sled is moving at a constant velocity of 1 m/s. What is the force of friction between the sled and ground?
What is the normal force experienced by the sled?
How much does the sled weigh?

Abasketball star covers 2.65 m horizontally in a jump to dunk the ball. his motion through space can be modeled precisely as that of a particle at his center of mass. his center of mass is at elevation 1.02 m when he leaves the floor. it reaches a maximum height of 1.90 m above the floor and is at elevation 0.910 m when he touches down again. (a) determine his time of flight (his "hang time"). (b) determine his horizontal velocity at the instant of takeoff. (c) determine his vertical velocity at the instant of takeoff. (d) determine his takeoff angle. (e) for comparison, determine the hang time of a whitetail deer making a jump with center-of-mass elevations yi = 1.20 m, ymax = 2.45 m, and yf = 0.750 m.