Posted by monnie on Wednesday, October 6, 2010 at 11:27pm.
At a construction site a pipe wrench struck the ground with a speed of 45 m/s. (a) From what height was it inadvertently dropped? (b) How long was it falling?

physics  Steven, Thursday, October 7, 2010 at 12:29am
Kinematics Equations:
Vx1 = Vx0 + axΔt
(Vx1)^2 = (Vx0)^2 + 2axΔx
Δx = Vx0Δt + ½ ax(Δt^2)
Using the second kinematics equation, we can solve for Δx.
(Vx1)^2 = (Vx0)^2 + 2axΔx
Plug in what you know:
(45 m/s)^2 = (0 m/s) + 2(9.8m/s^2)(? m)
2025 m^2/s^2 = (19.6 m/s^2)(? m)
(? m) = (2025 m^2/s^2)/(19.6 m/s^2)
? m = 103.3163265
(sig figs) = 100 m
Δx = 100m

Using the first kinematics equation, we can solve for Δt.
Vx1 = Vx0 + axΔt
Plug in what you know:
Vx1 = Vx0 + axΔt
45 m/s = 0 m/s + (9.8 m/s^2)(Δt)
Δt = (45 m/s)/(9.8 m/s^2)
Δt = 4.591836735
(sig figs) =
Δt = 4.6 s
Let me know if that helped you!

physics  monnie, Thursday, October 7, 2010 at 12:53am
yes it did help and i get it now thank you

physics  maria, Friday, February 4, 2011 at 3:35pm
shouldn't acceleration be 9.8 and not +9.8 since it freefalling in the negative direction?
Answer This Question
Related Questions
 physics  At a construction site a pipe wrench struck the ground with a speed of...
 science  At a construction site a pipe wrench struck the ground wiht a speed of...
 math  Throwing a Wrench. An angry construction worker throws his wrench ...
 Physics  a worker on the roof of a building that is under construction dropped ...
 math  An angry construction worker throws his wrench downward from a height of ...
 Math  a wrench is dropped by a worker at a construction site. four seconds ...
 Physics  a worker on the roof of a building that is under construction dropped ...
 Physics  A PVC pipe that is one meter long is struck and the speed of sound is ...
 Physics  A PVC pipe that is one meter long is struck and the speed of sound is ...
 Physics  A helicopter rises vertically with a constant upward acceleration of 0...
More Related Questions