Answer:
m = 0.305 [kg]
Explanation:
When a body rests on a horizontal surface and is in balance we can say that normal force is the reaction of the weight of a body.
Weight is defined as the product of mass by gravitational acceleration.
[tex]N=W=m*g[/tex]
where:
N = normal force = 3 [N]
g = gravity acceleration = 9.81 [m/s²]
m = mass [kg]
Now replacing:
[tex]3=m*9.81\\m=0.305[kg][/tex]
