A rifle with a barrel length of 610 cmfires a 100 g, Ask an Expert

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A rifle with a barrel length of 61.0 cmfires a 10.0 g bulletwith a horizontal speed of 360 {\rm m/s} .The bullet strikes a block of wood and penetrates to a depth of14.0 cm.

a) What frictional force (assumed to be constant) does thewood exert on the bullet?

b) How long does it take the bullet to come to rest?

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