Question 4

A bullet moves east at a velocity of 480 m∙s-1. It hits a wooden block that is fixed to the  floor. The bullet takes 0,01 s to move through the stationary block and emerges from the block at a velocity of 80 m∙s-1 east. See the diagram below.

Ignore the effects of air resistance.

Consider the block-bullet system as an isolated system.

4.1 Explain what is meant by an isolated system as used in Physics. (4)

The magnitude of the momentum of the bullet before it enters the block is 24 kg∙m∙s-1.

4.2 Calculate the:

4.2.1 Mass of the bullet (3)

4.2.2 Average net A force exerted by the wooden block on the bullet (5)


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