SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which formula is used to find average velocity?
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Vavg = (rfinal-rinitial)/(tfinal-tinitial)
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Vavg = (rinitial-rfinal )/(tinitial-tfinal )
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Vavg = (afinal-ainitial)/(tfinal-tinitial)
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Vavg = (ainitial-afinal)/(tinitial-tfinal)
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Explanation:
Detailed explanation-1: -velocity = displacement/time and average velocity = initial velocity + final velocity/2.
Detailed explanation-2: -In general, Vavg is the integral of V with respect to t from Vinitial to Vfinal divided by tfinal-tinitial. In this case, V = 4t m/s, so the integral wrt t is 2t^2, which gives 2 x 25 = 50 m, divided by 5 s, = 10 m/s.
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