Physics OpenStudy (anonymous):

Three balls of clay with m1=40 g, m2=30 g and m3=20 g are moving with velocities v1=4.0 m/s at 315 deg, v2=3.0m/s at 180 deg and v3=2m/s at 90deg respectively (all angles are given relative to the +x axis). The masses collide and create a single blob of clay. A)Determine the magnitude and direction of the blob after the collision. B)Determine the velocity of the center of mass before the collision. OpenStudy (anonymous):

The momentum will be conserved. First, calculate the momentum of the three object independently. Find the component in the x and y direction. Second, find the velocity after the collision. \[m_1 v_1 + m_2 v_2 + m_3 v_3 = (m_1 + m_2 + m_3) v'\]Use this equation for the velocity in the x and y directions. The center of mass will move in the same was as the blob. That is, there velocities will be the same.

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