acceleration and velocity questions

8. [-/7 Points] DETAILS An object is moving along a straight line according to the following position function. s(t) = V 512 + 4 Time is measured in minutes and position in meters. At what positive time is the velocity of the object 1 m/min? t= What is the acceleration at any time ? a(t) = Is the acceleration function ever negative? O Yes O No Submit Answer 9. [4/8 Points] DETAILS PREVIOUS ANSWERS A particle is moving along a straight line with t 2 0 (in seconds) according to the position function s(1) = (2 1) where s(t) is the distance from the origin in feet. What is the velocity of the particle at any time ? 8t (1 + 1) (1 -1) v ( t ) = (12 +1) 3 What is the velocity of the particle when t = 3.5 seconds? (Round your answer to four decimal places.) v(3.5) =