Position of an ant ( S in metres) moving in Y - Z plane is given by S = 2 t 2 j ^ + 5 k ^ (where t is in second). The magnitude and direction of velocity of the ant at t = 1 s will be :

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The velocity of the ant can be found as follows: v → = d S → d t = d d t 2 t 2 j ^ + 5 k ^ = 4 t j ^ . . . 1 At t = 1 s , from equation (1), it follows that v → = 4 j ^

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