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3 D 53686
Section C (Essay Type)

Essays-Answer in about two pages, any one question.
The question carries 10 marks.
20. Define potential energy.
(a) Obtain Potential energies of a uniform force field.
(b) Obtain Potential energy of a central force ; and
(c) Obtain the Potential energy of the Three-dimensional Spring Force.

21. State Newton's laws of motion. Apply Newtons laws to find the accelerations of two astronauts of

masses M, and Mg, pulling on either ends of a rope of negligible mass.

(1 x 10 = 10 marks)

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