A skydiver wants to jump out of a plane and be in free fall while she sketches some motion graphs for a Gr. 11 physics problem. She figures the quickest she can complete the sketches is 17 s. She then wants to open her parachute at the last moment so she can reach a
safe velocity just when she reaches the ground. Generally, a skydiver can walk away unharmed when they hit the ground at 5.6 m/s.
The average acceleration that the parachute can provide is 18.1 m/s [upwards).
How high will the plane be when she jumps? We can assume that she initially has no velocity in the vertical direction.

this is a good question! i'll do some research and come back when i have the answer!

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

answer and explanation;

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.