High School

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Q2) The graph shows the speed of a firework shell during a flight of 20 seconds:

250

200

150

(s/u) paads

100

50

O

2

4

6

8

10

12

14

16

18

20

Time (s)

a) Work out the rate of change during the first 4 seconds.

b) Work out the rate of change between 8 seconds and 12 seconds.

Q2 The graph shows the speed of a firework shell during a flight of 20 seconds 250 200 150 s u paads 100 50 O

Answer :

Answer:

a. 37.5

b. 25

Step-by-step explanation:

a. Rate of change the first 4 seconds can be calculated using the points (0, 0) and (4, 150):

Rate of change = [tex] \frac{y_2 - y_1}{x_2 - x_1} = \frac{150 - 0}{4 - 0} = \frac{150}{4} = 37.5 [/tex]

b. Rate of change between 8 seconds and 12 seconds using the points (8, 150) and (12, 250):

Rate of change = [tex] \frac{y_2 - y_1}{x_2 - x_1} = \frac{250 - 150}{12 - 8} = \frac{100}{4} = 25 [/tex]

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