35/49 Marks Oil is leaking out of a tank.
The depth of oil in the tank for 60 seconds is shown below.
100
Use the graph to work out an
estimate for the rate of decrease
of depth, in cm/s, at 10 seconds.
You must show your working,
80
I
Depth (cm)
60
40
20
oo
10
20
50
60
30 40
Time (5)
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