Car a is moving at a constant velocity along a horizontal surface when it collides with Kaur-B which is at rest after the collision the two carts stick together state whether the following quantities will increase decrease or remain constant during the collision

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!