g LON-CAPA Rock thrown off a x LON-CAPA course contents x Q LON-CAPA calaulating

Question

g LON-CAPA Rock thrown off a x LON-CAPA course contents x Q LON-CAPA calaulating Force x What is the y component of the initial velocity? 8.88 m/s Opts You are correct. Submissions to practice problems are not permanently recorded If you ignore air resistance, how many seconds elapse from when you release the rock until the roo 0.906 s Opts You are correct. Previous Tries Submissions to practice problems are not permanently recorded If you ignore air resistance, what is the height of the cliff? 212.209 m Opts Tries 3/99 Previ Incorrect. Submissions to practice problems are not permanently recorded. Submit Answer If you ignore air resistance, what is the x component of the velocity of the rock right before it hits 14.84 m/s Opts Previous Tries You are correct. are not permanently recorded Submissions to practice problems it hit If you ignore air resistance, what is the y component of the velocity of the rock right before 8.884 m/s Tries 5/99 Prev Opts not permanently recorded Submit Answer Submissions to practice problems are

Explanation / Answer

Vx= V0 cos30.9 = 17.3 cos30.9 = 14.84 m/s

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V0y = V0 sin30.9 = 8.88 m/s

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at maximum height,

v = 0

v = u + a t In vertical,

0 = 8.88 - 9.8t

t = 0.907 s

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In vertical,

y = v0y t + ay t^2 /2

y = (8.88 x 3.2) + (-9.8 x 3.2^2 / 2) = - 21.76 m

height =- y = 21.76 m

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vfy = v0y + ay t

vfy = 8.88 + (- 9.81 x 3.20) = - 22.5 m/s

hence velocity is 22.5 m/s downward

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