Physics · May / June 2020 · Paper 42 · Question 1
0625
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The question as text
Fig. 1.1 shows the speed–time graph of a person on a journey. On the journey, he walks and then waits for a bus. He then travels by bus. He gets off the bus and waits for two minutes. He then walks again. His journey takes 74 minutes. 0 0 10 20 30 40 50 60 70 80 10 20 30 40 50 speed km / h time / min Fig. 1.1
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1(a)(i)[3]
s = vt in any form OR (s =) vt OR relates distance to area (under graph)
any one of: 5 × 20 / 60 OR 40 × 20 / 60 OR 6 × 22 / 60
(s = 1.667 + 13.333 + 2.2 =) 17 km
1(a)(ii)[2]
average speed = candidate’s (i) / time
(average speed = 17 × 60 / 74 =) 14 km / h
1(b)[2]
gradient
(gradient =) change of speed / time
1(c)[2]
0
(constant) gradient = 0 OR speed constant
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