The K.E. of a body of mass 2kg and momentum of 2Ns is:
Correct answer: A. 1 J
- A. 1 J
- B. 2 J
- C. 3 J
- D. 4 J
Explanation
Given:mass(m)=2kg, momentum(p)=2Nswe know; p=mvv=p/m v=1ms-1Kinetic energy (K.E)= 1/2(mv2)K.E=1/2(pv) K.E=1/2x(2x1)K.E=1J
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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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