Abox with a mass of 100.0 kg slides down a ramp with a 50 degree angle. what is the weight of the box? n

The weight of the box is 980 N

Explanation:

We have data about the problem: 1 box, with a mass (M) of 100.0 kg. The box slides down a ramp with a 50-degree angle.

As the weight only depends on the gravity force, it will have a direction towards the center of the earth. It means the angle is not important to calculate the weight.

So, the weight (W) of the mass (M) can be calcualted as the product of M and gravity (g). We can suppose a gravity value of:

Finally, we can conclude that the weigth is 980 N. 

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)