A particle in free-fall: a) takes 42 seconds to travel 490 meters at g=9.8 m/s2 B) takes 15.8 seconds to travel 490 meters at g= 9.8 m/s2 C) takes 4.5 seconds to travel 490 meters at g= 9.8 m/s2 D) takes 10 seconds to travel 490 meters at g= 9.8 m/s2

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A particle in free-fall: a) takes 42 seconds to travel 490 meters at g=9.8 m/s2 B) takes 15.8 seconds to travel 490 meters at g= 9.8 m/s2 C) takes 4.5 seconds to travel 490 meters at g= 9.8 m/s2 D) takes 10 seconds to travel 490 meters at g= 9.8 m/s2

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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Given u=0 h=490m g=9.8m/s^2 t=?
Use h=ut+.5gt^2
ok thanks

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Can u tell me the right option?
Anyway welcome!!
No its not B
Vf = Vi + at you know everything except t. solve for t.
sorry, also use vf^2 - vi^2 = 2aX
the answer is not B...its 9.9 sec so its D

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