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anonymous
 4 years ago
An object is dropped from rest and falls freely 20. meters to Earth. When is the speed of the object 9.8 meters per second?
anonymous
 4 years ago
An object is dropped from rest and falls freely 20. meters to Earth. When is the speed of the object 9.8 meters per second?

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.01) during the entire first second of its fall (2) at the end of its first second of fall (3) during its entire time of fall (4) after it has fallen 9.8 meters

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0at the end of its first second of fall

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0v = u + at 9.8 = 9.8t t = 1 sec

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0v final velocity u initial velocity a acceleration t time free fall a = 9.8 v is negative as it is going down

JamesJ
 4 years ago
Best ResponseYou've already chosen the best response.0Alternatively: acceleration is by definition change in velocity. Here the acceleration is is a constant, g in the downward direction. Hence of the object starts at rest and has velocity v in the downward direction at time t, then by definition \[ acceleration = \frac{v}{t} = g \] i.e., \( v = gt \) Hence \[ v = g \] when \( t = 1 \) second.
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