Physics
15.06.2020 10:25
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A 30-g bullet is fired with a horizontal velocity of 450 m/s andbecomes embedded
A 30-g bullet is fired with a horizontal velocity of 450 m/s andbecomes embedded in block B, which has a mass of 3 kg. After theimpact, block B slides on 30-kg carrier C until it impacts the endof the carrier. Knowing the impact between B and C is perfectlyplastic and the coefficient of kinetic friction between B and C is 0.2,determine (a) the velocity of the bullet and B after the first impact,(b) the final velocity of the carrier.
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Aydenj9613
4,4(66 marks)
a) 
b) 
Explanation:
a) Let's use the conservation of linear momentum.
Where:
m(b) is mass of bullet (0.03 kg)v(ib) is the initial velocity of the bullet (450 m/s)m(B) is the mass of the block (3 kg)v(f) is the final velocity of the bullet and the block
b) As we have an external force between B and C we can not use the conservation of linear momentum here. We need to use the work definition.
The work here is due to the friction force.
I hope it helps you!
carlchang2025
4,7(60 marks)
After reaching highest point, the ball velocity is starting increasing again but in downwards direction with an acceleration of about 9.8m/s ^2.
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