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Which of the following can be regarded as an example for three dimensional motions?

(a) Motion of planets around the sun

(b) Motion of a train along a straight track

(c) Motion of a free falling body

(d) A kite flying on a windy day

I have been asked this question in my homework.

My doubt is from Motion and Mechanics in division Advanced Engineering Materials of Engineering Physics II

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Right answer is (d) A kite flying on a windy day

The best I can explain: The motion of an object is said to be three dimensional if all the three coordinates specifying the position changes with respect time. Thus kite flying on a windy day is an example for three dimensional motions.

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