Homework Help: Physics

Posted by Dakota on Sunday, September 2, 2012 at 6:34pm.

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, Sunday, September 2, 2012 at 6:51pm
.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

Answer this Question

Related Questions

Physics - An elevator is moving upward at 0.90 m/s when it experiences an ...
Physics - An elevator is moving upward at 1.03 m/s when it experiences an ...
physics - An elevator is moving upward at 0.93 m/s when it experiences an ...
physics - An elevator is moving upward at 1.00 m/s when it experiences an ...
physics - An elevator is moving upward at 1.20 m/s when it experiences an ...
Physics - An elevator is moving upward at 0.97 m/s when it experiences an ...
Physics - A 96.6-kg person stands on a scale in an elevator. What is the ...
Physics - 74.0-kg person stands on a scale in an elevator. What is the apparent ...
Physics - A 97.0-kg person stands on a scale in an elevator. What is the ...
physics - An elevator is initially moving upward at a speed of 12.84 m/s. The ...

For Further Reading

First Name:
School Subject:
Answer: