You stand on a bridge above a river and drop a rock into the water below from a height of 53 m. What is the acceleration of the rock as it falls

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.

Iwould sure like to answer your question but i honestly just don’t know

Protons have a positive charge and, collectively, give an element its atomic number.