A 5 Newton force directed East and a 5 Newton force directed north act concurrently on a point. The resultant of the two force is ..?

Aroller coaster car moving at a velocity of 30 meters/second has a momentum of 2.5 x 10^4 kilogram meters/second. what is its mass?

Can anybody me with this? ? (picture included.)

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.