Posted by **Jalopy** on Thursday, November 29, 2012 at 8:10pm.

A 12.8 gram bullet embeds itself in a 2.370 kg block on a horizontal frictionless surface which subsequently collides with a spring of stiffness 487 N/m. The maximum compression of the spring is 11.0 centimetres.

a) What was the initial speed of the bullet in m/s?

b) How long did it take for the bullet-block system to come to rest after contacting the spring?

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