A ball of mass m approaches a heavy wall...

A ball of mass m approaches a heavy wall of mass M with speed 4 m/s along the normal to the wall. The speed of wall before collision is 1m/s towards the ball. The ball collides elastically with the wall. What can you say about the speed of the ball after collision? Will it be slightly less than or slightly higher than 6 m/s ?

`5 "m s "^(-1)` away from the wall

`9 "m s "^(-1)` away from the wall

`3 "m s "^(-1)` away from the wall

`6 "m s "^(-1)` away from the wall

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