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[tex]velocity \: of \: 90 \frac{km}{h} \: \: \: - \\(a) in \: its \: si \: unit({ \frac{m}{s} }) = 90 \times \frac{5}{18} = 5 \times 5 = 25 \: \frac{m}{s} \\(b)in \: c.g.s \: unit (\frac{cm}{s})=2500 \: \frac{cm}{s} [/tex]

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