If the Direction of the Net Force is Opposite to the Direction of Motion Now ass

Question

If the Direction of the Net Force is Opposite to the Direction of Motion Now assume that the net force is so as to push a particle of mass M in the direction which is OPPOSITE to the direction in which it is already moving. If the net force has a constant magnitude F, then the particle will once again accelerate with an acceleration of magnitude a F/M (from Newton's Second Law that EF- mã) Assume that the net force does not act for a time which is long enough so that the particle could reverse direction Part D Fill in the two blanks. Choose the best answer from the list below. Remember that the net force does not act for sufficient time to cause the particle to reverse direction. by an amount at, and if the constant force is applied over a given distance D, along the path of the particle, then If the constant force is applied for a fixed interval of time t, then the speed of the particle will the kinetic energy of the particle will by an amount FD increase, decrease decrease, increase increase, increase decrease, decrease Previous Answers Correct Good work. For this case, the work W done on the particle by the force F over the distance D is -FD. The minus sign comes from the dot product in the definition of work.

Explanation / Answer

Part E

Since force is in opposite direction of motion,velocity will decrease so kinetic energy will also decrease

Work done by force=-FD

Initial KE=0.5*m*v^2

By work energy theorem

Change in kinetic energy=work done

So

Final kinetic energy=0.5*M*vi^2-FD

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