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An 825-kg cannon rests on a frictionless surface and fires a 1.12-kg projectile at 124 meters per second to the right. What is the velocity of the cannon immediately after the projectile is fired?

A. 0.124 m/s to the left
B. 0.152 m/s to the left
C. 0.168 m/s to the left
D. 0.174 m/s to the left

Answer :

Given,

Mass of the cannon, m₁=825 kg

Mass of the projectile, m₂=1.12 kg

The velocity of the projectile, v₂=124 m/s

According to the law of conservation of momentum, the momentum of the projectile fired should be equal to the momentum of the cannon.

i.e.,

[tex]m_1v_1=m_2v_2[/tex]

Therefore the velocity of the cannon is given by,

[tex]v_1=\frac{m_2v_2}{m_1}[/tex]

On substituting the known values in the above equation,

[tex]v_1=\frac{1.12\times124}{825}=0.168\text{ m/s}[/tex]

Therefore the velocity of the cannon immediately after the projectile is shot is 0.168 m/s

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