Question

derive first law of motion (v=u+at)
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Answer 1

Its is given by: v = 20 m/s, u = 5 m/s, i.e., v - u = 20 - 5 = 15 m/s. So, from the graph: OC - OD = CD = Difference in velocity = 15 m/s. Now, if you are moving with a uniform acceleration 'a', we also know that change in velocity per unit time is acceleration.