3.3. 0.5 A boy walks 20m left, turns and walks 30m right. He then turns and walks 50mleft. Using a scale diagram, find the resultant vector. ​

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.