Odpowiedź:
[tex]40 \frac{m}{s} = 40 \frac{1000}{3600} = 40 \times 3.6 = 144 \frac{km}{h} [/tex]
[tex]45 \frac{km }{h} = 45 \div \frac{1000}{3600} = 45 \div 3.6 = 12.5 \frac{m}{s} [/tex]
[tex]2400 \frac{kg}{ {m}^{3} } = 2400 \times \frac{1000}{1000000} = 2400 \times 1000 = 2400000 \frac{g}{ {cm}^{3} } [/tex]
[tex]4.5 \frac{g}{ {cm}^{3} } = 4.5 \div \frac{1000}{1000000} = 4.5 \div 1000 = 0.0045 \frac{kg}{ {m}^{3} } [/tex]
