Physics
posted by Dakota .
An elevator is moving upward at 0.90 m/s when it experiences an acceleration 0.40 m/s2 downward, over a distance of 0.64 m. What will its final velocity be?

Physics 
Damon
.64 = .9 t  .5(.4)t^2
.2 t^2  .9 t + .64 = 0
t = [.9 +/ sqrt (.89  .512) ]/.4
t = [ .9 +/ .615 ]/ .4
we want on the way up so use shorter time
t = .713 seconds
v = Vi + a t
v = .9  .4 (.713)
v = .615 m/s
Respond to this Question
Similar Questions

Physics
An elevator is initially moving upward at a speed of 11.04 m/s. The elevator experiences a constant downward acceleration of magnitude 3.84 m/s2 for 3.06 s. (a) Find the magnitude and direction of the elevator's final velocity. (b)How … 
physics
An elevator is initially moving upward at a speed of 12.84 m/s. The elevator experiences a constant downward acceleration of magnitude 3.80 m/s2 for 3.18 s. (a) Find the magnitude and direction of the elevator's final velocity. magnitude: … 
Physics
An elevator is moving upward at 0.90 m/s when it experiences an acceleration 0.40 m/s2 downward, over a distance of 0.64 m. What will its final velocity be? 
physics
An elevator is moving upward at 1.20 m/s when it experiences an acceleration 0.25 m/s2 downward, over a distance of 0.71 m. What will its final velocity be? 
Physics
An elevator is moving upward at 0.97 m/s when it experiences an acceleration 0.34 m/s 2 downward, over a distance of 0.80 m. What will its final velocity be? 
physics
An elevator is moving upward at 1.00 m/s when it experiences an acceleration 0.28 m/s2 downward, over a distance of 0.74 m. What will its final velocity be? 
physics
An elevator is moving upward at 0.93 m/s when it experiences an acceleration 0.29 m/s2 downward, over a distance of 0.67 m. What will its final velocity be? 
physics
1) A boy sledding down a hill accelerates at 1.40 m/s, If he started at rest, in what distance would he reach a speed of 7.00 m/s? 
Physics
An elevator is moving upward at 1.03 m/s when it experiences an acceleration 0.31 m/s2 downward, over a distance of 0.73 m. What will its final velocity be? 
Physics
An elevator is moving upward 1.17 m/s when it experiences an acceleration of 0.33 m/s2 downward, over a distance of 0.75 m. What will its ﬁnal speed be?