- #36

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yes,its all true,the red arrow has only horizontal and vertical components,has not got any component along the common normal i.e perpendicular to the red one,for the bodies to be in contact the velocities along the common normal should be the same,how the contact still remains ?View attachment 312968

W.r.t the ground the velocity of the sled when the mass is at some angle ##\theta## is represented by the green arrow

W.r.t the ground the velocity of the mass on the sled in the horizontal direction is the projection of the red arrow onto the horizontal directionplusthe green arrow.

In general, the velocity of the sled in the horizontal direction will not equal the velocity of the mass in the horizontal direction.

It is at pointA, when the projection of the red arrow onto the green arrow is ##0##, that the velocity of the sled matches the velocity of the mass.