# Physics

A ball is thrown toward a cliff of height h with a speed of 31 m/s and an angle of 60∘ above horizontal. It lands on the edge of the cliff 3.4 s later.

What is the ball's impact speed?

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1. the horizontal velocity is
... 31 m/s * cos(60º)

the vertical velocity is
... 31 m/s * sin(60º) +
... 3.4 s * -9.8 m/s^2

add the two component vectors
... a^2 + b^2 = c^2

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