45 Figure I Figure li C1981M2 A swing seat of mass M is connected to...

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45 Figure I Figure li C1981M2 A swing seat of mass M is connected to a fixed point P by a massless cord of length L A child also of mass M sits on the seat and begins to swing with zero velocity at a position at which the cord makes a 60 angle with the vertical is shown in Figure I The swing continues down until the cord is exactly vertical at which time the child jumps off in a horizontal direction The swing continues in the same direction until its cord makes a 45 angle with the vertical as shown in Figure II at that point it begins to swing in the reverse direction a Determine the speed of the child and seat just at the lowest position prior to the child s dismount from the seat b Determine the speed if the seat immediately after the child dismounts c Determine the speed of the child immediately after he dismounts from the swing

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