Mr Uranus of mass of 75 kg sits on his butt and slides down an icy hill with a coefficient of friction 0.200 and sloped at an angle of 45^o. Determine the average drag force if he accelerates from rest to 20 m/s over a 50 m distance.

Ms. Vulcan has a mass of 50 kg and Mr. X. weighs 187 lbs. Together they hang from a bungee cord of stiffness 75 N/m. a) If they are at rest and at the equilibrium position then determine how much the bungee cord has been stretched.

b) If they currently have an instantaneous acceleration of 0.5 g's upwards, then what is the current stretch of the bungee cord? c) If they currently have an instantaneous acceleration of 0.1 g's downwards, then what is the current stretch of the bungee cord?

Ms. Ceres pulls a 100 kg sled with a force of 1 000 N [South 30^o Up] along a flat snowy pathway with a coefficient of friction of 0.200. The sled is attached to her friend Mr. Eris whom is skiing and masses 50 kg. a) Determine the acceleration of the sled and wagon and the time it will take to reach a cruising speed of 4 m/s. b) Now add 3 more objects to the string train: sled 15 kg, toboggan 10 kg and a snowboard 5 kg and determine the new acceleration and time.