4. A stone is thrown vertically upwards at 24.5 m./sec. from a point on the level with but just beyond a cliff ledge. Its height above the ledge t sec. later is 4.9t ( 5 – t) m. . If its velocity is v m./sec., differentiate to find v in terms of t : i) when is the stone at the ledge level ? ii) find its height and velocity after 1, 2,3, and 6 sec.. iii) what meaning is attached to negative value of s ? a negative value of v ? iv) when is the stone momentarily at rest ? what is the greatest height reached ? v) find the total distance moved during the 3rd sec..

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Projectile Motion