KE & PE PROBLEMS.

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Presentation transcript:

KE & PE PROBLEMS

John has an object suspended in the air John has an object suspended in the air. It has a mass of 50 kg and is 50 m above the ground. How much work would the object do if it was dropped? Gravity is 9.8 m/s2.

Mrs. Jacobs dropped an object from 10 m Mrs. Jacobs dropped an object from 10 m. She knows it did 50 joules of work and gravity is 9.8 m/s2. How much was its mass?

Thomas dropped an 20 kg object Thomas dropped an 20 kg object. He knows it did 120 joules of work and gravity is 9.8 m/s2. How high was the object when it was dropped?

What is the mass of a man running at 4 What is the mass of a man running at 4.34 m/s if he has a kinetic energy of 826.8 joules?

What is the speed of a 63.8 kg woman running with a kinetic energy of 1156 joules?

What is the speed of a 140.1 kg woman running with a kinetic energy of 1307 joules?

What is the mass of a man running at 3 What is the mass of a man running at 3.26 m/s if he has a kinetic energy of 724.8 joules