Hii please help i’ll give brainliest!!

Which statement best explains why an object weight less on mercury than it does on earth

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

If a simple machine reduces the strength of a force, what must be increased?