What forces are acting on a ball at its highest point ie; Grav force, normal force, etc. Clarification: A ball is tossed up and reaches its highest point, that's the point I need to know what forces are acting upon the ball when its in that stage.

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Aregular polygon has angkes of size 150° each. how many side has the polygon

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.