A car increase it's speed from 20 Km/hr to 40km/hr in 10seconds. find its acceleration ​

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?