3. A 1000-g ball is tied to a string 60 cm long and is whirled in a vertical circle at 1 revolution per second. If the tension at the highest point is zero, what is the speed of the body at the highest point? 4. A body is moving along a circular path of radius 2.86 m. If the centripetal force on the body is three times its weight, find the period of the motion.

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Q: initial position E W.

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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!