Final answer:
The weight of a 50kg block on Earth is calculated by multiplying its mass with the acceleration due to gravity, resulting in a weight of 490 N.
Step-by-step explanation:
The weight of a block is the force due to gravity acting on the mass of the block. The weight can be calculated using the formula weight (W) = mass (m) × acceleration due to gravity (g), where g is typically 9.8 m/s² on Earth. Therefore, for a block with a mass of 50kg, the weight W equals 50kg × 9.8 m/s², which calculates to 490 N (newtons).