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A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 35.0 m above sea level, directed at an angle è above the horizontal with an unknown speed v0.
The projectile remains in flight for 6.00 seconds and travels a horizontal distance D of 170.0 m. Assuming that air friction can be neglected, calculate the value of the angle è

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