A ball is thrown straight up in the air with an initial speed of 40 m/s. Ignore air resistance and take g- 10m/s?. what is the speed of the ball when it reach 40 m above the ground? o 20 m/s 20/2 mis 2/20 mis 3/20 mis 20/3 mis

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 1.3 m/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/s^2 and in g's) does the hip under go to reduce its speed from 2.0 m/s to 1.3 m/s? The acceleration that you found in part "a" may seem very large, but to fully understand its effects on the hip, calculate how long it lasts.

So this is the problem I am trying to figure out: A boy tosses a coin straight up to 2.2 m. Suppose the height when the coin leaves his hand is 1.3 m. What was the initial speed of the coin when it left his hand?

$57