a) 560 x 10^6 km
en 255 j
1 j = 24 h
255 x 24 = 6120 h
vitesse v = 56 x 10^7/6120 = 91503. 27 km/h
b) t = 248 x 10^6/300000 = 248 x 10^6/3 x 10^5 = 826.67s/3600 = 0.23 h soit 13 min 48 s
7h 48 + 13 = 8 h 1 min
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a) 560 x 10^6 km
en 255 j
1 j = 24 h
255 x 24 = 6120 h
vitesse v = 56 x 10^7/6120 = 91503. 27 km/h
b) t = 248 x 10^6/300000 = 248 x 10^6/3 x 10^5 = 826.67s/3600 = 0.23 h soit 13 min 48 s
7h 48 + 13 = 8 h 1 min