You throw a ball downward from a window at a speed of 1.9 m/s. How fast will it be moving when it hits the sidewalk 2.2 m below?

Answer 1

final KE is equal to the initial KE added to the initial PE

1/2 m vf^2=1/2 m vi^2 + mg (2.2)
solve for vf

Answer 2

i don't understand what mg is..we havent learned that?

Answer 3

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