Question

A particle is moving in one dimension, its displacement – time relation is given as s = (2t2 + 5) where s is in meters and t is in seconds. Find its velocity (in m/s) at t = 1 second.

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Answer :

Correct answer is : 4

s = 2t2 + 5

v = d s d t = 4 t

at t = 1, v = 4 m/s

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