A bullet of mass 20 g is fired from a stationary rifle of mass 3 kg. Assume that the
bullet moves horizontally. Immediately after firing, the rifle recoils (moves back) with a
velocity of 1,4 m∙s-1.
4.1 Calculate the speed at which the bullet leaves the rifle. (4)
The bullet strikes a stationary 5 kg wooden block fixed to a flat, horizontal table. The bullet is brought to rest after travelling a distance of 0,4 m into the block. Refer to the diagram below.
4.2 Calculate the magnitude of the average force exerted by the block on the bullet. (5)
4.3 How does the magnitude of the force calculated in QUESTION 4.2 compare to the magnitude of the force exerted by the bullet on the block? Write down only LARGER THAN, SMALLER THAN or THE SAME. (1)
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