Two balls with masses m1 = 2kg and m2 = 4kg are moving with velocities of v1 = (5i – 3j+8k) m/s and v2 = (li +5j – 12k) m/s when they collide and stick together. What is: • The velocity of the balls after the collisions. • The type of collision described.

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**Problem Statement:**

Two balls with masses \( m_1 = 2 \, \text{kg} \) and \( m_2 = 4 \, \text{kg} \) are moving with velocities of 
\[
\vec{v_1} = (5\hat{i} - 3\hat{j} + 8\hat{k}) \, \text{m/s} 
\]
and 
\[
\vec{v_2} = (1\hat{i} + 5\hat{j} - 12\hat{k}) \, \text{m/s} 
\]
when they collide and stick together. What is:

- The velocity of the balls after the collision.
- The type of collision described.

**Solution:**

1. **Velocity After Collision:**
   - When two objects stick together after a collision, it is an inelastic collision. The combined velocity can be found using the conservation of momentum:
   \[
   m_1\vec{v_1} + m_2\vec{v_2} = (m_1 + m_2)\vec{v_f}
   \]
   - Solve for \(\vec{v_f}\):
     \[
     \vec{v_f} = \frac{m_1\vec{v_1} + m_2\vec{v_2}}{m_1 + m_2}
     \]
   - Calculate:
     \[
     \vec{v_f} = \frac{2(5\hat{i} - 3\hat{j} + 8\hat{k}) + 4(1\hat{i} + 5\hat{j} - 12\hat{k})}{2 + 4}
     = \frac{(10\hat{i} - 6\hat{j} + 16\hat{k}) + (4\hat{i} + 20\hat{j} - 48\hat{k})}{6}
     \]
     \[
     = \frac{(14\hat{i} + 14\hat{j} - 32\hat{k})}{6}
     = \left(\frac{14}{6}\hat{i} + \frac{14}{6}\hat{j} - \frac{32}{6}\hat{k}\right)
Transcribed Image Text:**Problem Statement:** Two balls with masses \( m_1 = 2 \, \text{kg} \) and \( m_2 = 4 \, \text{kg} \) are moving with velocities of \[ \vec{v_1} = (5\hat{i} - 3\hat{j} + 8\hat{k}) \, \text{m/s} \] and \[ \vec{v_2} = (1\hat{i} + 5\hat{j} - 12\hat{k}) \, \text{m/s} \] when they collide and stick together. What is: - The velocity of the balls after the collision. - The type of collision described. **Solution:** 1. **Velocity After Collision:** - When two objects stick together after a collision, it is an inelastic collision. The combined velocity can be found using the conservation of momentum: \[ m_1\vec{v_1} + m_2\vec{v_2} = (m_1 + m_2)\vec{v_f} \] - Solve for \(\vec{v_f}\): \[ \vec{v_f} = \frac{m_1\vec{v_1} + m_2\vec{v_2}}{m_1 + m_2} \] - Calculate: \[ \vec{v_f} = \frac{2(5\hat{i} - 3\hat{j} + 8\hat{k}) + 4(1\hat{i} + 5\hat{j} - 12\hat{k})}{2 + 4} = \frac{(10\hat{i} - 6\hat{j} + 16\hat{k}) + (4\hat{i} + 20\hat{j} - 48\hat{k})}{6} \] \[ = \frac{(14\hat{i} + 14\hat{j} - 32\hat{k})}{6} = \left(\frac{14}{6}\hat{i} + \frac{14}{6}\hat{j} - \frac{32}{6}\hat{k}\right)
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