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What will be the work done in raising the velocity of a car weighing 800 kg from 18 km/h to 54 km/h |
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Answer» Answer: Initial Velocity, u=54km/hr=15m/s Final velocity , v=72km/hr=20m/s Mass =1500kg Initial kinetic ENERGY 1
mu 2
⇒ 2 1
1500×15×15=168750J Final kinetic energy 2 1
2
⇒ 2 1
1500×20×20=300000J So, CHANGE in kinetic energy = work done=300000−168750=131250J |
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