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Maximum distance spring compressed.

  • Thread starter AnnieD
  • Start date
  • #1
24
0
A block of mass m = 1.9 kg is dropped from height h = 77 cm onto a spring of spring constant k = 1510 N/m (Fig. 8-38). Find the maximum distance the spring is compressed.

My attempt:
mgh = 1/2kx^2
(1.9)(9.8)(.77) = (.5)(1510)x^2
x = 0.138m

But it's not the correct answer.
What am I doing wrong?
 

Answers and Replies

  • #2
3,763
8
gravity is still working on the block when it is compressing the spring

by writing h in your potential energy, you are saying that h is the distance onlong which the block "feels" gravity

you are gonna need to add something there...

marlon
 

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