# Can we conserve something?

A block of mass M rests on a frictionless horizontal table at a distance of $$400\text{ mm}$$ from a fixed pin $$O$$. The block is attached to the pin $$O$$ by an elastic cord of a force constant K and undeformed length $$900\text{ mm}$$ .

If the block is set in motion perpendicularly, find the radius of curvature in cm when the block is at 1.2 m

Component of velocity along the string vanishes when length is 1.2m Details and assumptions:

• $$K=100 \text{ N/m}$$.
• $$M=500\text{ g}$$.
×