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A ball of mass m is thrown at an angle a...

A ball of mass m is thrown at an angle `alpha` to the horizontal with the initial velocity `v_0`. Find the time dependence of the magnitude of the ball's angular momentum vector relative to the point from which the ball is thrown. Find the angular momentum M at the highest point of the trajectory if `m=130g`, `alpha=45^@`, and `v_0=25m//s`. The air drag is to be neglected.

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