Ima Bratt is at the park with her father. The 25.0 kg Ima is on a swing following the path as shown below. Ima has a speed of 0 m/s at position A and is a height of 3.0 m above the ground. At position B, Ima is 1.0 m above the ground. At position C (2.0 m above the ground), Ima projects from the seat and travels as a projectile along the path shown. At point F, Ima is a negligible distance above the ground. Assume negligible resistance throughout the motion. How much work must Ima's father do to get her up to point A?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.