weight and masses?

Question

a. What is the weight of Catalina's guitar if it has a mass of 15 kilograms?

b. What is the mass of Li's motorcycle if its weight is 490 newtons?

c. If a guitar pick has a mass of 0.005 kg, what is its weight?

Answer 1

a. w=mg gravity(g)=10m/s squared
=15*10
=150N

b. m=w/g
=490/10
=49kg

c. w=mg
= 0.005*10
=0.05kg

sorry, i had to use * as multiplication sign