How many newtons does a 5-kg backpack weigh on earth?

First of all, I will tell you the quick and easy way to find the answer. The equation is 9.8 multiplied by 5. You always use the number 9.8 because that is the measurement of Earth's gravity. You use the number 5 because that is the mass of the object you are measuring. That number changes depending on the object's mass.

A 5kg backpack would weigh 49 Newtons on Earth. Good luck with science or whatever you needed this for!!