Make alist of as many ways you can think of , in which energy is used in a large office block

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?