Why is it helful to make the central ideas of the text to give you an. overview

to help you define

to learn additional details about the topic of the text

to help you read with greater focus on the text à Puppose​

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.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle