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An object falls from rest, and s =-16t² where s feet is the distance of the object from the starting point at t seconds, and the positive direction is upward

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An object falls from rest, and s =-16t² where s feet is the distance of the object from the starting point at t seconds, and the positive direction is upward. If a stone is dropped from a building 256 ft high, find A. the instantaneous velocity of the tone 1 sec after it is dropped; B. the instantaneous velocity of the stone 2 sec after it is dropped; C. how long it takes the stone to reach the ground; D. the instantaneous velocity ot the stone when it reaches the ground.