Or
Option 2
Or
Option 3
Or
Option 4
3.1

Motion of an object under the influence of the gravitational force only. Or Motion in which the only force acting on the object is gravitational force. Tips:

2 marks (1 x 2 marks) 
3.2.1

Δt = 0,67 – 0,64 = 0,03 s Tip: the time that the ball is in contact with the floor, is the time when the position is zero as shown in the graph below:

2 marks (1 x 2 marks) 
3.2.2

Option 1 Tips:
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2 marks (1 x 2 marks) 
3.2.3

Option 1 Upwards as positive: ^{(1)} ^{(2)} ^{(3)} Or Downwards as positive: ^{(1)} ^{(2)} ^{(1)} Tip: the ball must move in the opposite direction to the direction of gravity. One value must be positive and the other must be negative. There are more ways to answer this question. To view other options, click here. 
3 marks (3 x 1 mark) Marking criteria:

3.2.4

How to approach this question:
Part 1: Option 1 Downwards as positive: ^{(1) } ^{(2)} Or Upwards as positive: ^{(1)} ^{(2) } Part 2: Option 1 Upwards as positive: ^{(3) } ^{(4) } ^{(5) } ^{(6) } Or ^{(3) } ^{(4)} ^{(5 + 6) } Or Downwards as positive: ^{(3) } ^{(4) } ^{(5) } ^{(6) }
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6 marks (6 x 1 mark) Option 1/2/3/4 marking criteria: Calculating initial velocity:
Calculating Δt:

Or
Option 2
Or
Option 3
Or
Option 4