How does adjusting the slider and changing the stiffness or spring of the trampoline affect the way energy is stored?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c