What is one way that testing helpes scientists determing which solution for a problem works best?

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

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.

Which levels of government establish and implement educational requirements for minors