Kinetic energy of a body moving with speed of 10 ms-1 is 30 If its speed becomes 30 ms-1 then its K.E becomes?
Correct answer: C. 270 J
- A. 10 J
- B. 90 J
- C. 270 J
- D. 180 J
Explanation
K.E = 1/2 mv2 K.E = v2 (m=constant) if v' = 3v ,then K.E' = 9K.E K.E'= 9K.E =9(30) K.E=270J numerical type question so only one answer possible.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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