A block having mass M M slides on a frictionless surface and collides with a block of mass 2 M , 2M, which is initially at rest. After the collision, the small block is at rest and the larger block is moving to the right with speed V / 2 . V/2. Is this collision elastic?

i need to show me the graph so i can give u an answer

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

the answer is 12 as i may remember

: )