### What angle did its velocity make with the vertical

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Q. A 3.2 mass attached to a spring with a spring constant of 114 is oscillating in a vat of oil, which damps the oscillations. If the damping constant of the oil is 10 kg/s, how long will it take the amplitude of the oscillations to decrease to 1.0% of its original value?

Q. A projectile, fired with unknown initial velocity, lands 21.8 s later on the side of a hill, 2790 m away horizontally and 479 m vertically above its starting point. (Ignore any effects due to air resistance.)

As it hit the hill, what speed did it have and what angle did its velocity make with the vertical?

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