A student measures the speed v of a trolley as it moves down a slope. The variation of v with time t is shown in this graph.

a. Use the graph to find the acceleration of the trolley when t = 0.70 s.
b. State how the acceleration of the trolley varies between t = 0 and t = 1.0 s.
Explain your answer by reference to the graph.
c. Determine the distance travelled by the trolley between t = 0.60 and t = 0.80 s.
d. The student obtained the readings for v using a motion sensor. The readings may have random errors and systematic errors. Explain how these two types of error affect the velocity–time graph.

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v/ms 1.2 0.8 0.4 0.2 0.4 0.6 0.8 1.0 t/s Figure 2.38