On a given planet, the weight of an object varies directly with the mass of the object. Suppose that an object whose mass is 9 kg weighs 45 N. Calculate the mass of another object that weighs 30 N.

6 kg

Step-by-step explanation:

Given is weight of an object directly varies with the mass of the object.

Let the constant of proportionality be k

So,

Weight = K * (mass of the object)

For an object, weight = 45 N

mass = 9 kg

So, 45 = K*9

K = 5.

Now, for the other object,

Weight = 30 N. K = 5 (as obtained above)

So, 30 = 5 * (mass of the object)

mass of the object = 6 kg