- #1
roam
- 1,271
- 12
Homework Statement
A 2kg block is dropped from a height of 40 cm onto a spring of force constant k=1960 N/m. Find the maximum distance the spring is compressed.
(The answer must be 10 cm)
The Attempt at a Solution
Well, I know that if a spring is stretched "y", it will be compressed "y". The problem is that I can't find out how long will the spring stretch once it is dropped from that height. Therefore I tried to use the formula
[tex]F = ky[/tex]
Where [tex]F= mg = 2 \times 9.81[/tex] and k =1960 N/m which is 196000 N/cm
[tex]2 \times 9.81 = (196000) k[/tex]
[tex]y= \frac{2 \times 9.81}{196000}[/tex]
But this gives me the wrong answer. Why is that??
By the way, I know that the tension is [tex]T= 2 \pi \sqrt{\frac{m}{k}} = 2 \pi \sqrt{\frac{2}{196000}}= 0.02 N[/tex].