Posted by **Bartholomew** on Thursday, January 15, 2009 at 7:57pm.

A 5 kg mass is thrown up with a velocity of 4 m/s from a height of 30 m onto a spring with a relaxed length of 10 m, and a constant of 400 N/m. What will the maximum compression of the spring be? What will the speed of the object be when the spring is compressed 0.3 m?

- Physics -
**drwls**, Thursday, January 15, 2009 at 8:09pm
Have you tried applying conservation of energy? Show your work and one of us will gladly critique it.

- Physics -
**Bartholomew**, Thursday, January 15, 2009 at 8:17pm
(V2^2)=(Vi)^2+2ad

0=16-19.6d

-16=-19.6d

d=0.816 m + 30 m = 30.816 meters above the ground

mgh = mgh + 1/2kx^2 = (5 kg)(9.8 m/s^2)(30.816) = 200x^2-49x+490

x=2.75 m

mgh=1/2kx^2+mgh+1/2mv^2

(5)(9.8)(30.186)=1/2(400)(0.3)^2+(5)(9.8)(9.7)+1/2(5v^2)

v=20.17 m/s

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