A47 kg child on a 1.5 m long swing is released 5 from rest when the swing supports make an angle of 22 ◦ with the vertical. the acceleration of gravity is 9.8 m/s 2 . if the speed of the child at the lowest position is 1.30868 m/s, what is the mechanical energy dissipated by the various resistive forces (e. g. friction, answer in units of j.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

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