Aboy standing on the top of a cliff projects an object upwards with a velocity of 60m/s.
after 10s he releases anothe object from the cliff so that the 2 obects meet at a specific point. find the distance from the top of the cliff to the point these objects meet with the correct  explanation .
  (ans. 31.25m)
i need in this

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

Which word expression describes how much to calculate pressure

Aphase diagram assumes is kept constant.