Aforce of 64 n is applied to an 8kg mass. what is the acceleration of the mass

If this is the only force applied, you could use the Newton's second law.

(this value corresponds to the modulo of the acceleration)

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.