A rock is thrown vertically upward with a speed of 13.0 m/sm/s from the roof of a building that is 70.0 mm above the ground. Assume free fall. What is the speed of the rock just before it strikes the ground?

At the lowest point of the waterfalls, water is moving at a speed of 40.0 meters per second. If the waterfall's height is 22.7 m. What is the water's velocity at the maximum height of the falls? A 36.89 m/s B 22.24 m/s 17.29 m/s D 14.93 m/s E) 33.99 m/s

1. Falls resulting in hip fractures are a major cause of injury and even death to the elderly. Typically, the hip's speed at impact is about 2.0m/s. If this can be reduced to 1.3m/s or less, the hip will usually not fracture. One way to do this is by wearing elastic hip pads. (a) If a typical pad is 5.0 cm thick and compresses by 2.0 cm during the impact of a fall, what constant acceleration (in m/s²) does the hip undergo to reduce its speed from 2.0 m s to 1.3m/s (b) The acceleration you found in part (a) may seem rather large, but to assess its effects on the hip fully, calculate how long it lasts. Note: convert cm to m first.

Dear Physics expert, the answer to the question is 18.4 m. Please explain your steps and be sure your solution matches. I will be sure to upvote, have a nice day.