1. A body of mass 5 kg initially at rest is subjected to a force of 20 N. What is the kinetic energy acquired by the body at the end of 10 s?
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2. A bullet of mass 50 g moving with a velocity of 400ms1 strikes a wall and goes out from the other side with a velocity of100ms1 . Calculate work done in passing through the wall.
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3. Energy released by the fission of one atom is 200 MeV. Calculate the energy released in kWh when one gram of uranium undergoes fission.
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4. Calculate the energy equivalent of 1 g of substance.
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5. State three differences between potential energy and kinetic energy.
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6. Name five different forms of energy.
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7. Identify the energy changes in the following: Glowing electric bulb, Microphone, Photovoltaic cell, Electric cell
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8. A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s?
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9. A boy weighing 42 kg makes a high jump of 1.5 m. What is his kinetic energy at the highest point? What is his potential energy at the highest point? (g = 10 m/s)
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10. Derive relation between Kinetic Energy and Momentum.