# physical

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A ball is thrown from the window of a high-rise building with an initial velocity of 7.7 m/s at an angle of 34 deg. below the horizontal. The bill strikes the ground 4.2 seconds after being thrown. Find the height from which the ball was thrown.

• physical -

y = H -7.7 sin34 t - 4.9 t^2.

y = 0 at t = 4.4 s

Substitute those y and t values into the first equation and solve for the initial height H

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