A 2.64 -g bullet moving at 280 m/s enters and stops in an initially stationary 2.10−kg wooden block on a horizontal frictionless surface. (a) What's the speed of the bullet/block combination? (b) What fraction of the bullet's kinetic energy was lost in this perfectly inelastic collision? (c) How much work was done in stopping the bullet? (d) If the bullet penetrated 5.00 cm into the wood, what was the average stopping force?

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