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Published by LOO SUAN FUN Moe, 2020-05-06 02:44:06

MM_F5_6 Area Under A Graph_2

MM_F5_6 Area Under A Graph_2

6.2 Area Under A graph

面积 距离

问题要求找的 distance
就像上一堂课学的 area

Distance travelled A - triangle
B - rectangle
B =  1  2  60  4  60   1  2  60 C - triangle
AC 2  2 

= 360 km

Distance travelled A - trapezium
B - rectangle
=  1 (10  20)  5  5 20  1 10 20 C - triangle

AB C 2  2 
= 275 m

AB C

(a)  1 (20  40) 8  10 40  1 12 40  880

2  2 
Total distance (30 minutes) = 880  14 2 km

60 3

(b) Average speed = 14 2  1 Total distance = 14 2 km
32 3

 29 1 kmh1 Total time = 30 minutes = 1 hour
3 2

distance

(a)  1  (t  6) 8   1 (8 12)  6  100 Time = t – (t – 6)
2  2  = t–t+6
4t  24  60  100
4t  36  100 =6
4t  100  36
t  64
4
t  16

100
(b) Average speed =

16
 6.25 ms1

page 185

(a) 180 km (b) 7.5 km

(a) 55 km
(b) 80 km
(c) 155 km

88 m


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