Bardzo proszę o pomoc! Muszę przeliczyć: 7200kg/m3 na g/cm3 20g/cm3 na g/dm3 15km/h na m/s 20km/h2 na m/s2 360 km/h na m/s

7200kg/m3 =? g/cm3 1kg =1000g 1m3 =1000 000cm3 1cm3 =0,000001m3 7200kg/m3 =7200 *1000g/0,000001cm3 =7,3g/cm3   20g/cm3 =? g/dm3 1dm3 =1000cm3 1cm3 =0,001dm3 20g/cm3 =20g/0,001dm3 =20 000g/dm3   15km/h =? m/s 1km =1000m 1h =3600s 15km/s =15 *1000m/3600s =4,17m/s   20km/h2 =? m/s2 20km/h2 =20 *1000m/(3600s)^2 =0.0015m/s2   360km/h =? m/s 360 *1000m/3600s =100m/s     (^ do potęgi)