Question

Figure shows a-t graph. Find average acceleration in first 20 s.
a(m/s)-

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Answer 1

Answer:

Average acceleration = total change in velocity / time taken

Total change in velocity = area under a-t curve

Area under a-t curve = (1/2)*(10+30)*20 = 400m/s

Change in velocity = 400m/s

Time taken = 30s

Average acceleration = 400/30

= 40/3 m/s^2