The position of a particle related to time is given by x = ( 5 t 2 - 4 t + 5 ) m . The magnitude of velocity of the particle at t = 2 s will be :

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It is given that x = 5 t 2 - 4 t + 5 The velocity is given by v = d x d t = d ( 5 t 2 - 4 t + 5 ) d t = 10 t - 4 At t = 2 s , v = 10 ( 2 ) - 4 = 16 m s - 1

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