Proposed Exercise: Planar Movement of a Rigid Body Translation In the situation illustrated below, a rectangular structure of mass 100kg and center of mass G descends an inclined plane. The structure is provided with wheels A and B of negligible mass. If Wheel A is locked, while B rotates freely. calculate the acceleration of the structure as it descends the plane. Consider that the coefficient of kinetic friction between Wheel A and the surface is uk=0.37

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

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

so easy. just google the electromagnetic waves and it’ll pop up.