A child, m = 25.0 kg, swings from a rope, L = 5.2 m, which hangs above water, d = 1.1 m, when vertical. The child is h = 8.8 m above the water when she begins to swing. Assume the child lets go at the bottom of the swing. How long does she take to reach the water, t in seconds?

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )