You pull a a block with 41.7 N while your friend pushed with 57.1 N. If friction is 65.4 N what is the net force on the block?

After a big snowfall, you take your favorite rocket-powered sled out to a wide field. the field is 195 m across, and you know that your sled accelerates at a rate of 3.65 m/s2 when the rocket is on. how much time will it take the sled to cross the field starting from rest, assuming the rocket is on the whole time?

Anybody wanna ? (picture included? )

Which is a substance that can be separated by physical means and is not the same throughout