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The traditional acceleration due to gravity (9.8
meters per second per second) is assuming a vacuum. However, for short
falls, it works out well.
For longer falls, the force of gravity is eventually equaled by the force of
air resistance. At this time the speed remains constant. As you are likely
aware, in order to have a change in velocity, an unbalanced force is
required.
The "terminal velocity" is determined by the shape of the object. Sky
divers can speed up and slow down by changing the shape they present to the
relative wind (the air going by them). Ultimately, they open their
parachute and greatly increase the for of the air resistance... (luckily!)
slowing them down considerably.
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An object with a mass of 8 kg is dropped and takes 2 s to hit the ground. Then another object with a mass of 16 kg is dropped from the same point. How long does it take to hit the ground?
2s
How long in seconds would it take for an object to fall 120 meters?
depends on weight of object and wind strength.normally heavy objects will drop down faster than lighter objects.
How long does it it take an object of 4 kg to hit the ground considering another object with a mass of 2 kg took 3 seconds to hit the ground?
Assuming they were in a vacuum, if both objects were dropped from th esame height, then both take the same length of time to reach the ground. All masses fall with the same acceleration, reach the same speed in the same period of time, and hit the ground at the same time. Otherwise and if there is an atmosphere or if they are dropped from different heights, you have not presented information; shape and size are the most important factors.
How long would it take for an object dropped from 54.6 meters to hit the ground?
D = 1/2 g T2T = sqrt(2D/g) = sqrt( 109.2 / 9.8 ) = 3.335 seconds(rounded)
How long does it take an object with a velocity of 2.5 meters a second up to fall 15m?
15 m divided by 2.5 m s-1 is 6 s.
