speed

A system of inertia 0.57 kg consists of a spring gun attached to
a cart. The system is at rest on a horizontal low-friction track. A 0.050-kgprojectile is loaded into the gun, then launched at an angle of 40∘with respect to the horizontal plane.
With what speed does the cart recoil if the projectile rises 2.1 m at its maximum height?
 
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