What is the weight of a 10kg object that is moving at 5m/s

w = 98.1[N]

Explanation:

The weight of a body independent of its speed or acceleration, will always be equal to the product of its mass by the acceleration of gravity.

In this case we have:

w = m * g

where:

m = mass = 10 [kg]

g = gravity = 9.81[m/s^2]

w = 10 * 9.81 = 98.1 [N]