A person who weighs 150 pounds on Earth would weigh 67.2 pounds on Mercury. How much would a child who weighs 60 pounds on Earth weigh on Mercury?

1 Answer
Aug 7, 2017

26.88 lb

Explanation:

Weight of person on Earth = 150 lb
150 = mg

Weight of person on Mercury = 67.2 lb
67.2 = ma

150/67.2 = (mg)/(ma) = g/a

a = (67.2g)/150


Weight of child on earth = 60 lb

60 = mg

m = 60/g

Weight of child on mercury = ma

= 60/g xx (67.2g)/150

= 26.88 lb


Simple Method

67.2/150 xx 100 = 44.8%

Weight of person on mercury decreased to 44.8%

Hence weight of child will also decreased to 44.8%

44.8 xx (60 lb)/100 = 26.88 lb