Study the graph shown. It is a graphic of a car trip taken by Karen and her mother. The starting position (0,0) is their home. Graph of position versus time with position on y axis from 0 to 80 miles and time on x axis from 0 to 5 hours. Segment 1 goes from 0, 0 to 1, 40. Segment 2 goes from 1, 40 to 2, 40. Segment 3 goes from 2, 40 to 3, 60. Segment 4 goes from 3, 60 to 4, 75. Segment 5 goes from 4, 75 to 5, 75. If Karen and her mother take three hours to come home, calculate the average speed of the car for the trip home.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

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.