A stone is thrown straight up from the ground with an initialspeed of 35.4 m/s.

Question

A stone is thrown straight up from the ground with an initialspeed of 35.4 m/s. At the same instant, a stone is droppedfrom a height of h meters above the ground level. The twostones strike the ground simultaneously. The acceleration of gravity is 9.8 m/s2 . Find the height h. ans. in units m. A stone is thrown straight up from the ground with an initialspeed of 35.4 m/s. At the same instant, a stone is droppedfrom a height of h meters above the ground level. The twostones strike the ground simultaneously. The acceleration of gravity is 9.8 m/s2 . Find the height h. ans. in units m.

Explanation / Answer

given the initial velocity of the thrown is U = 35.4 m/s so the time of the flyght is t = 2U/g   = 7.2244s as the second ball also took the same time we have h = 1/2gt2    = 255.74 m    = 255.74 m          

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