Final answer:
The volume of the iron block with dimensions 10cm×5cm×2cm is 100 cm³, which corresponds to option A.
Step-by-step explanation:
To find the mass of a block of iron with dimensions 10cm×5cm×2cm, you would first calculate its volume by multiplying those dimensions together. To perform the calculation: volume = length × width × height = 10cm × 5cm × 2cm = 100 cm³. This is the volume of the iron block, not its mass. If you are looking for the mass and have the density, which is 7.9 g/cm³ for iron as provided in the reference, you would then multiply the volume by the density to get the mass: mass = volume × density = 100 cm³ × 7.9 g/cm³. However, the choices provided seem to be asking for volume only, so the correct answer would be option A: 100 cm³.