One railroad cart which weighs 18,000 kg collides with a stationary cart that weighs 12,000 kg and they lock together. If their speed immediately after the collision is 8.5 m/s, then what was the speed of the first one before the collision?

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**Physics Problem: Conservation of Momentum in a Collision**

**Scenario:**
A railroad cart weighing 18,000 kg collides with a stationary cart weighing 12,000 kg. After the collision, the carts lock together and move as one unit. Their speed immediately after the collision is 8.5 m/s.

**Question:**
What was the speed of the first cart before the collision?

**Solution Approach:**
This problem can be solved using the principle of conservation of momentum, which states that the total momentum of a closed system remains constant if no external forces are acting on it.

The momentum before the collision equals the momentum after the collision:

\[ m_1 \times v_1 + m_2 \times v_2 = (m_1 + m_2) \times v_f \]

Where:
- \( m_1 = 18,000 \, \text{kg} \) (mass of the first cart)
- \( v_1 \) = initial speed of the first cart (unknown)
- \( m_2 = 12,000 \, \text{kg} \) (mass of the stationary cart)
- \( v_2 = 0 \, \text{m/s} \) (initial speed of the second cart)
- \( v_f = 8.5 \, \text{m/s} \) (final speed of the combined carts)

Substituting the known values, you can solve for \( v_1 \).
Transcribed Image Text:**Physics Problem: Conservation of Momentum in a Collision** **Scenario:** A railroad cart weighing 18,000 kg collides with a stationary cart weighing 12,000 kg. After the collision, the carts lock together and move as one unit. Their speed immediately after the collision is 8.5 m/s. **Question:** What was the speed of the first cart before the collision? **Solution Approach:** This problem can be solved using the principle of conservation of momentum, which states that the total momentum of a closed system remains constant if no external forces are acting on it. The momentum before the collision equals the momentum after the collision: \[ m_1 \times v_1 + m_2 \times v_2 = (m_1 + m_2) \times v_f \] Where: - \( m_1 = 18,000 \, \text{kg} \) (mass of the first cart) - \( v_1 \) = initial speed of the first cart (unknown) - \( m_2 = 12,000 \, \text{kg} \) (mass of the stationary cart) - \( v_2 = 0 \, \text{m/s} \) (initial speed of the second cart) - \( v_f = 8.5 \, \text{m/s} \) (final speed of the combined carts) Substituting the known values, you can solve for \( v_1 \).
Expert Solution
Step 1

Given data: 

Mass of first railroad (m1) = 18000 kg

Mass of cart (m2) = 12000 kg

Initial velocity of cart (V2) = 0 m/s

Final velocity (v) = 8.5 m/s

Required:

The initial speed of first railroad before collision (V1

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