Answer:1.37
Explanation:
Given
Man run along the side walk and take 2.1 s
While walking in the opposite direction it takes 13.2 s
Let the speed of man and sidewalk be 
Let the distance between two points be x


From 1 & 2 we can get



Answer:
Plz mark brainliest
Explanation:
As with kinetic energy, potential energy can change. When two objects interact, each one exerts a force on the other that can cause energy to be transferred to or from the other object.