# physics

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A cannon is fired horizontally from a platform (see figure). The platform rests on a flat, icy, frictionless surface. Just after the shell is fired and while it is moving through the barrel of the gun, the shell (mass 3.0 kg) has an acceleration of +2450 m/s2. At the same time, the cannon has an acceleration of -0.78 m/s2. What is the mass of the cannon?

• physics -

massshell*accelerationshell+massgun*accelerationgun=0

Conservation is conserved, the total momentum before the firing was zero, so the momentum after the firing is zero.

solve for the mass of the gun.

• physics -

thank you very much

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