9514 1404 393
Answer:
a) correct, 34 m/s
b) 42.5 m/s
Step-by-step explanation:
a) The average speed is ...
speed = distance/time = 1700 m/50 s = 34 m/s
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b) Distance is the area under the speed curve. For t < 30, the area is ...
A = LW = 30k
For t > 30, the area is ...
A = 1/2bh = 1/2(50 -30)(k) = 10k
The the total distance is ...
(30k +10k) = 1700
k = 1700/40
k = 42.5 . . . m/s
