8 - In the figure, the skater left the ice at a speed of 10m/s and at an angle of 150 above the plane, and the plane was making an angle of 500 with the x-axis, the distance the skater travels before reaching the ground. - My vehicle speed just before landing on the ground.

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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!