Which of these points shows the greatest acceleration

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Which accurately compares concave and convex lenses?

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.