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As the masses of the ball and plane are not given,and as it given in the question that the ball is small , we assume it as the collision between the heavy body (inclined plane ) and light body (ball).
In the horizontal direction the heavy body is moving but the ball has no horizontal momentum.There fore after collision the horizontal velocity of plane will almost be the same but the ball will have horizontal velocity double that of the plane ,ie, Vx=4 m/s.
In the vertical direction as the plane has no component in this direction it is at rest in the vertical direction.So the ball will rebound back with the same vertical velocity it had before the collision ,ie, Vy=2 m/s.
So total velocity of ball V=sq root(4^2+2^2)= 4.47 m/s
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