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XinXan (OP)
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June 11, 2015, 04:00:11 PM
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Say a ball of 1Kg, you let it fall (frefall) from 50 meters, how long does it take to reach the ground? Whats the formula
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rapsaodan84
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June 11, 2015, 04:04:38 PM
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Quote from: XinXan on June 11, 2015, 04:00:11 PM
Say a ball of 1Kg, you let it fall (frefall) from 50 meters, how long does it take to reach the ground? Whats the formula

If you ignore the resistance of the air then the formula you're looking for is:
distance = initial velocity (0 if the object is dropped) • time + ½ • gravity • time^2
from there you can calculate time.

Check "Example Problem A" here: http://www.physicsclassroom.com/class/1DKin/Lesson-6/Kinematic-Equations-and-Free-Fall
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December 14, 2017, 12:23:03 AM
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Quote from: rapsaodan84 on June 11, 2015, 04:04:38 PM
Quote from: XinXan on June 11, 2015, 04:00:11 PM
Say a ball of 1Kg, you let it fall (frefall) from 50 meters, how long does it take to reach the ground? Whats the formula

If you ignore the resistance of the air then the formula you're looking for is:
distance = initial velocity (0 if the object is dropped) • time + ½ • gravity • time^2
from there you can calculate time.

Check "Example Problem A" here: http://www.physicsclassroom.com/class/1DKin/Lesson-6/Kinematic-Equations-and-Free-Fall


Okay, so what's the formula in a Flat-earth model where gravity doesn't exist?
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