1.When one body rolls over the surface of another body, the resistance to its motion is callad (a) fluid friction
(b) drag
(c)rolling friction
(d)sliding friction
2.Envelop of air is known as the
(a)Gase
(b)Atmosphere
(c)Diffusion (d)permiable membrane
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d number is the answer of this question
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d number is the answer of this question
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