Mushroom rocks are: Group of answer choices

A formed by grains of sand blown across the rocks' surfaces.

B rocks with many mushrooms growing around them.

C formed by wind and water erosion.

D All of the above.

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?

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.