7. An object is thrown vertically into the air. Which of the following five grap

Question

7. An object is thrown vertically into the air. Which of the following five graphs represents the velocity (v) of the object as a function of the time ()? The positive direction is taken to be upward. A) I B)IC)III D) IV E) v 8. We say that the displacement of a particle is a vector quantity. Our best justification for this assertion is: displacement can be specified by a magnitude and a direction operating with displacements according to the rules for manipulating vectors leads to results in agreement with experiments a displacement is obviously not a scalar displacement can be specified by three numbers displacement is associated with motion A) B) C) D) E)

Explanation / Answer

the answer is

C) iii

because when the object thrown vertically up then it has initial positive velocity and moving up its velocity decreases and the object disaccelelarate. At highest point the velocity is zero .. then the object start falling and velocity again increases..

8)

displacement is defined as the smalest path between two points

displacement= final position- initial position

so the answer is

B) operating with displacements according to the rules for manipulating vectors leads to result in agrement with experiments

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