Unformatted text preview: We have to be careful to include the directions of the velocities. In the case of onedimensional motion, we can use plus and minus signs to indicate the directions. ( 29 ( 29 ( 29 2 10 m s 30 m s 4 s is up 10 m s f i v v t a= = = +You can also reason this out in two steps. On the way up it is slowing down at a rate of 10 m/s 2 , so it will take three seconds to reach the top where the speed is zero. On the way down, it is speeding up at the same rate, so it will take one additional second to attain the velocity of 10 m/s downward. 22. We use our equations for onedimensional motion. ( 29 ( 29 2 10 m s 4 s 40 m s f v a t = = = ( 29 ( 29 2 2 2 1 1 2 2 10 m s 4 s 80 m d a t = = = or 40 m/s 20 m/s 2 2 i f v v v + + = = = ( 29 ( 29 20 m/s 4 s 80 m d vt = = =...
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 Fall '02
 GregoryFrancis
 Acceleration, Velocity, 10 m, 20 m/s, 10 m/s

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