Everything Science Grade 12

CHAPTER 6. MOTIONIN TWO DIMENSIONS 6.2

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-9,8

2 4

time (s)

acceleration (m

·s

−

2 )

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Exercise 6 - 2

1. Amanda throws a tennisball from a height of 1 , 5 m straight up into the air and
   then lets it fall to the ground. Draw graphs of Δx vs t; v vs t and a vs t for
   the motion of the ball.The initial velocity of the tennisball is 2 m· s−^1. Choose
   upwards as positive.


2. A bullet is shot straight upwards from a gun. The following graphis drawn.
   Downwards was chosenas positive

(a) Describe the motionof the bullet.

(b) Draw a displacement - time graph.

(c) Draw an acceleration - time graph.

t(s)

v( m· s−^1 )

200

− 200

20 , 4

40 , 8

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(1.) 01s2 (2.) 01s3