In a ballistics test, a 25.0g bullet traveling horizontally at 1100m/s goes through a 40.0cm -thick 250kg stationary target and emerges with a speed of 900m/s . The target is free to slide on a smooth horizontal surface.(adsbygoogle = window.adsbygoogle || []).push({});

the 1st question of this problem ask: How long is the bullet in the target?

I simply do:

40.0cm=0.4m ; 0.4m/(900m/s)=4.4*10^-4

The answer shows 4.0*10^-4

Did I make a mistake or it is just a rounding problem?

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# Homework Help: Ballistics Momentum problem

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