Please help!

9.

9. | You throw a 5.5 g coin straight down at 4.0 mfs from a 35-m-high bridge. a. How much work does gravity do as the coin falls to the water below? b. What is the speed of the coin just as it hits the water? 21. II A 500 g particle moving along the x-axis experiences the force shown in FIGURE 39.21. The particle's velocity is 2.0 m/s at x = 0 m. What is its velocity at x = 3 In? FAN) FAN) 15 10 FIGURE EX9.21 FIGURE EX9.22 34. III An 8.0 kg crate is pulled 5.0 m up a 30 incline by a rope angled 18 above the incline. The tension in the rope is 120 N, and the crate's coefficient of kinetic friction on the incline is 0.25. a. How much work is done by tension, by gravity, and by the normal force?49. II A 50 kg ice skater is gliding along the ice, heading due north at 4.0 Infs. The ice has a small coefficient of static friction, to prevent the skater from slipping sideways, but 31..., = 0. Suddenly, a wind from the northeast exerts a force of 4.0 N on the skater. 21. Use work and energy to find the skater's speed after gliding 100 m in this wind. 37. | a. How much work must you do to push a 10 kg block of steel across a steel table at a steady speed of 1.0 m/s for 3.0 s? b. What is your power output while doing so