Two particles of masses m and 4m have linear momenta in the ratio of 2:1. What is the ratio of their kinetic energies?
Correct answer: D. 16
- A. √2
- B. 2
- C. 4
- D. 16
Explanation
Formula:KE1/KE2= p1/p2²m2/m1 Calculation:KE1/KE2 =( 2/1)^2 ×{4/1} = 4 ×4 = 16 The ratio of kinetic energies is 16:1.
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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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