My classmate and I are swinging on the playground. The weight of a classmate is 75 kg, the length of the swing is 2.5 m. (a) With what force should we initially hold a classmate in a direction perpendicular

My classmate and I are swinging on the playground. The weight of a classmate is 75 kg, the length of the swing is 2.5 m.

(a) With what force should we initially hold a classmate in a direction perpendicular to the rope so that the swing is deflected by an angle of 30◦?
(b) At what acceleration does a classmate begin to move when we lower the swing?
(c) With what force does a classmate press on the swing as it swings through the lowest position?

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