A body of mass 2kg moving having momentum and velocity 8Ns and 4ms-1 respectively. Its K.E. equal to:
Correct answer: A. 16 J
- A. 16 J
- B. 32 J
- C. 8 J
- D. 2 J
Explanation
Option A is correct.Given data: P=8 Ns , v=4ms-1 Ignoring massFind out: K.E.=?Solution:The formula for kinetic energy is: K.E = (1/2) * mv² where: m is the mass of the object v is the velocity of the object We know that momentum=p=mvPutting the value of momentum in kineticenergy equation and we get;K.E=1/2*(mv)*v = 1/2*PV Putting value of P and v =1/2*8*4 =16J
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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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