physics

A bullet of mass 6.45 g is fired from a 66.0 cm-long rifle barrel at 237 m/s. The mass of the rifle is 4.50 kg. Determine the acceleration of the bullet as well as the recoil acceleration of the rifle

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  1. acceleration time t
    0.660 meters = (1/2) a t^2
    237 = a t so t = 237/a
    then
    0.660 = (1/2) a (237^2/a^2)
    0.330 a = 237^2
    a = 237^2/0.330

    momentum is conserved
    so
    4.50 v rifle = .00645 v bullet at all times
    so
    a rifle = (.00645/4.50) a bullet

    check my arithmetic !

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    Damon

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