Weight is the force exerted on an object due to gravity. It is directly proportional to the mass of the object and the acceleration due to gravity. The SI unit of weight is the newton (N). The formula to calculate weight is:

$$\text{Weight} = \text{Mass} \times \text{Acceleration due to gravity}$$

In this case, the mass is 5.75 kg and the acceleration due to gravity is approximately 9.8 m/s².

$$\text{Weight} = 5.75\ \text{kg} \times 9.8\ \text{m/s}^2 = 56.35\ \text{N}$$

Therefore, 5.75 kg is equal to 56.35 newtons.