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A projectile is fired on level ground with elevation angle α radians, where 0 < α...

A projectile is fired on level ground with elevation angle α radians, where 0 < α < π/2, and initial speed v0 metres per second. How many metres way does the projectile land if the only force acting on it is gravity, namely −gj metres per second per second, where g is the (positive) gravitational constant. Given an answer in terms of α, v0, and g.

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