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Position of an ant ( "S" in metres) movi...

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

A

"4m/s" in "y" -direction

B

"4m/s" in "x" -direction "

C

"16m/s" in "y" -direction "

D

"9m/s" in "z" -direction "

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The correct Answer is:
A
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