A 55.0 kg ice skater, initially at rest on a flat skating rink, requires a 188.0 N horizontal force to be set in motion. However, after the skater is in motion, a horizontal force of 167.0 N keeps her moving at a constant velocity. Find the coefficients of static and kinetic friction between the skates and the ice.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?