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Linear Momentum and Collisions

Two spheres collide on a horizontal frictionless surface. The first sphere has mass 1.0 kg is initially moving at 3.0 m/sec, the second sphere has mass 2.0 kg is intially at rest. Show the algebraic steps what is the velocity of the first sphere after the collision?

a) if there was an elastic collision

b) if there was an inelastic collision

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