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A cannon with a muzzle speed of 100 m/s is used to start an avalanche on a mountain slope. The target is 250 m

A cannon with a muzzle speed of 100 m/s is used to start an avalanche on a mountain slope. The target is 250 m from the cannon horizontally, and 80 m above the cannon. At what angle, above the horizontal, should the cannon be fired?

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