An astronaut launches an experimental object at 25.0 m/s at an angle of 40° on the surface of an alien planet. What is the range of the object on level ground? (Use g = 18.0 m/s2 )

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.