Mario weighing 60 kg gets a running jump towards Sonic and wishes to hit him in such a way as to propel him directly towards Robotnik at 2m/s to the...

Mario weighing 60 kg gets a running jump towards Sonic and wishes to hit him in such a way as to propel him directly towards Robotnik at 2m/s to the left. What initial velocity must Mario have if after the collision with Sonic Mario has no momentum in the horizontal direction and descends in free fall?