# Problem: A thin rod of length 2.8 m and mass 4.2 kg is held vertically with its lower end resting on a frictionless horizontal surface. The rod is then let go to fall freely. Determine the speed of its center of mass just before it hits horizontal surface. The acceleration due to gravity is 9.8 m/s2. 1. 4.53652 2. 3.42929 3. 4.84974 4. 4.92494 5. 4.02119 6. 4.3715 7. 5.07198 8. 4.2 9. 4.77336 10. 3.83406

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###### Problem Details

A thin rod of length 2.8 m and mass 4.2 kg is held vertically with its lower end resting on a frictionless horizontal surface. The rod is then let go to fall freely. Determine the speed of its center of mass just before it hits horizontal surface. The acceleration due to gravity is 9.8 m/s2.

1. 4.53652

2. 3.42929

3. 4.84974

4. 4.92494

5. 4.02119

6. 4.3715

7. 5.07198

8. 4.2

9. 4.77336

10. 3.83406 Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Conservation of Energy with Rotation concept. You can view video lessons to learn Conservation of Energy with Rotation. Or if you need more Conservation of Energy with Rotation practice, you can also practice Conservation of Energy with Rotation practice problems.

How long does this problem take to solve?

Our expert Physics tutor, Jeffery took 4 minutes and 53 seconds to solve this problem. You can follow their steps in the video explanation above.