A bullet fired into a truck of a tree loose 1/4 of ke in travelling a distance of 5cm before stoping it travels a further distance of
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15cm. We can use the trick,Further distance traveled= (n-1).x Where n is the fractional loss in KE and x is the distance traveled penetrating the tree.In the above question fractional loss in KE = 1/4 so, n=4 and it travels distance 5 cm so x is 5 Hence the further distance traveled is 15 cm.
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