- #1
kunparekh18
- 6
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Hello everyone. First post here. I'll go the question straightaway.
A gun of mass "M" placed on a smooth horizontal surface fires a bullet of mass "m" with a velocity "u" at an angle "θ" with the horizontal (ground). The velocity of the center of mass of the gun+bullet system after firing is (in terms of M,m,u and θ)?
I know the velocity of the center of mass is given by the equation
v = mv / m
I expanded the above equation to V = (Mv1 + mv2)/(M+m), where v2 and v1 are the velocities of masses M and m after firing.
However, I do not know what values to substitute for v1 and v2. I substituted v2 to be ucosθ as it is along the horizontal, and then used the conservation of linear momentum principle to get v1=-mucosθ/M
substituting these values if the original formula, I got a wrong answer. The final answer is supposed to be
musinθ/(M+m)
What mistake have I done here? Thanks in advance for explaining.
Homework Statement
A gun of mass "M" placed on a smooth horizontal surface fires a bullet of mass "m" with a velocity "u" at an angle "θ" with the horizontal (ground). The velocity of the center of mass of the gun+bullet system after firing is (in terms of M,m,u and θ)?
Homework Equations
I know the velocity of the center of mass is given by the equation
v = mv / m
The Attempt at a Solution
I expanded the above equation to V = (Mv1 + mv2)/(M+m), where v2 and v1 are the velocities of masses M and m after firing.
However, I do not know what values to substitute for v1 and v2. I substituted v2 to be ucosθ as it is along the horizontal, and then used the conservation of linear momentum principle to get v1=-mucosθ/M
substituting these values if the original formula, I got a wrong answer. The final answer is supposed to be
musinθ/(M+m)
What mistake have I done here? Thanks in advance for explaining.
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