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[" The velocity "v" of a body moving alo...

[" The velocity "v" of a body moving along a straight line "],[" varies with time "t" as "v=2t^(2)e^(-t)" ,where "v" is in "],[m/s" and "t" is in second.The acceleration of body "],[" is zero at "t=],[[" (1) "0," (2) "2s],[" (3) "3," (4) Both "(1)&(2)]]

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