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Finding Average Velocity

91) A project...

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91) A projectile is thrown with some initial velocity at anangle α to the horizontal. Its velocity when it is at thehighest point is \sqrt{2/5}times the velocity when it is atheight half of the maximum height. Find the angle ofprojection α with the horizontal.(a) 30^°(b) 45^°(c) 60^°(d) 37

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