Answer:
ω=v/r.
Explanation:
<em><u>angular velocity= linear velocity/radius</u></em>
Answer:
9 cm.
Explanation:
The energy used for stretch the spring from
to
will be ,
The energy used for stretch the spring from
to
will be ,
using the energy of spring formula ,we find that


Dividing both the equation will get,

Therefore, the natural length of the spring is, 9 cm.
It makes an echo and it circles around it.