1. A 65-kg ice hockey goalie, originally at rest, catches a 0.145-kg hockey puck slapped at him at a velocity of 35 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. A sketch from the animation from Part 1 should look like this. Note the subscripts i and f indicate velocities before and after the collision, respectively. The subscripts p and g represent the puck and the goalie, respectively. Before collision m, After Collision Vpf (mo Vpi m m₂ Vgi=0

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The question presented asks about the relative velocities of two objects and whether they are equal and opposite before and after an event.

1. **Statement:**  
   "The initial relative velocities of the two objects is equal and opposite to the final relative velocities of the two objects."

2. **Options:**
   - True
   - False

3. **Question (c):**  
   "What would their final velocities be in this case? Use 3 significant figures."

4. **Input Fields:**
   - \( v_{p, f} = \) ____ m/s
   - \( v_{g, f} = \) ____ m/s

A section at the bottom mentions:  
"Answering the question(s) helps us recommend your next activity." 

There are also other options available for those who may not wish to answer immediately.
Transcribed Image Text:The question presented asks about the relative velocities of two objects and whether they are equal and opposite before and after an event. 1. **Statement:** "The initial relative velocities of the two objects is equal and opposite to the final relative velocities of the two objects." 2. **Options:** - True - False 3. **Question (c):** "What would their final velocities be in this case? Use 3 significant figures." 4. **Input Fields:** - \( v_{p, f} = \) ____ m/s - \( v_{g, f} = \) ____ m/s A section at the bottom mentions: "Answering the question(s) helps us recommend your next activity." There are also other options available for those who may not wish to answer immediately.
### Collision and Momentum in Ice Hockey

1. A 65-kg ice hockey goalie, originally at rest, catches a 0.145-kg hockey puck slapped at him at a velocity of 35 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came.

**Diagram Explanation:**

The provided diagram illustrates the momentum and velocity of the hockey puck and goalie before and after a collision:

- **Before Collision:**
  - The puck, with mass \( m_p \), is moving towards the goalie with an initial velocity \( v_{pi} \).
  - The goalie, with mass \( m_g \), is initially at rest, so \( v_{gi} = 0 \).

- **After Collision:**
  - The puck is reflected back with a final velocity \( v_{pf} \).
  - The goalie moves forward with a final velocity \( v_{gf} \).

### Key Concepts:

- **Elastic Collision:** A collision in which both momentum and kinetic energy are conserved.
- **Subscripts:**
  - \( i \) and \( f \) represent initial and final velocities, respectively.
  - \( p \) and \( g \) denote the puck and the goalie.

This scenario presents a real-world application of physics principles such as conservation of momentum and elastic collisions, illustrating how different masses can affect velocity outcomes during interactions.
Transcribed Image Text:### Collision and Momentum in Ice Hockey 1. A 65-kg ice hockey goalie, originally at rest, catches a 0.145-kg hockey puck slapped at him at a velocity of 35 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. **Diagram Explanation:** The provided diagram illustrates the momentum and velocity of the hockey puck and goalie before and after a collision: - **Before Collision:** - The puck, with mass \( m_p \), is moving towards the goalie with an initial velocity \( v_{pi} \). - The goalie, with mass \( m_g \), is initially at rest, so \( v_{gi} = 0 \). - **After Collision:** - The puck is reflected back with a final velocity \( v_{pf} \). - The goalie moves forward with a final velocity \( v_{gf} \). ### Key Concepts: - **Elastic Collision:** A collision in which both momentum and kinetic energy are conserved. - **Subscripts:** - \( i \) and \( f \) represent initial and final velocities, respectively. - \( p \) and \( g \) denote the puck and the goalie. This scenario presents a real-world application of physics principles such as conservation of momentum and elastic collisions, illustrating how different masses can affect velocity outcomes during interactions.
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