# physics

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You throw a ball downward from a window at a speed of 2.0m/s. The ball accelerates at 9.8m/s^2. How fast is it moving when it hits the sidewalk 2.5m below?

• physics -

initial speed: 2 m/s
a: -9.8 m/s^2
s: -2.5 m
final speed: ?
Vf^2 - Vi^2 = 2as

v^2 - 2^2 = 2•-9.8•-2.5

v^2-4 = 49

v^2 = 53
final speed is approx. 7.28

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