1).What is mechanical weathering?\
2.)How do water, ice, wind, and organisms cause mechanical weathering?
ASAP

mechanical weathering  --is the process of breaking big rocks into little ones

when rivers or ocean waves cause rocks to collide and scrape against each other. Ice can cause mechanical weathering when glaciers cause rocks to scrape against each other. Ice can also cause mechanical weathering when water gets in cracks in rocks, and then freezes and expands.

Explanation:

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.