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a =4m
b = 20 cm = 0,2 m
c = 4 cm = 0,04 m
Obliczamy objętość deski
V = a*b*c = 4 m * 0,2 m * 0,04 m = 0,032 m^3
d= 0,5 g cm3 m
m=d*V
20cm*4cm*400cm=80cm*400cm=32000cm3
m=32000 cm3 * 0,5g/cm3 = 16000g=16 kg