What is the density of an object with a mass of 20 grams and a volume of 5 cm?

Which one of the following research methods can show cause and effect

What is the angular momentum of the bar about the axle?

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?