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A bullet is fired from a gun. The force on the bullet is given by f =  600- 2 x 10 5 t where F is in newtons and t in seconds. The force on the bullet becomes zero as soon as it leaves the barrel. What is the average impulse imparted to the bullet

(a)  9 Ns                                    (b)  Zero

(c)   0.9 Ns                                 (d)  1.8 Ns

ans. c

(23)

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