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4.30 A.22 rifle bullet, traveling at 350 m/s, strikes a large tree, which it penetrates to a depth of 0.130 m. The mass of the bullet is 1.80 g. Assume

a constant retarding force. (a) How much time is required for the bullet to stop? (b) What force, in newtons,does the tree exert on the bullet?

Fig: 1