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Ber [7]
3 years ago
14

If a ball dropped from a tower reaches the ground after 3.5 seconds, what is the height of the tower? Given: g = –9.8 meters/sec

ond2
Physics
1 answer:
xxMikexx [17]3 years ago
8 0
The distance covered by an object starting from rest
and accelerating uniformly is . . .

                     Distance  =  (1/2 of acceleration) x (time)²

                                       = (1/2 · 9.8 m/s²)  x  (3.5 s)²

                                       =      (4.9 m/s²)  x  (3.5 s)²

                                        =      (4.9 m/s²)  x  (12.25 s²)

                                       =        (4.9 x 12.25)   meters

                                       =            60.025  meters 
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Answer:

\huge\boxed{50g}

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Half-life- The time taken for half of the radioactive isotopes to decay.

Explanation:

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Since a half-life is the time taken for half of the isotopes to decay, we can simply divide the initial mass of 100 grams by 2; this gives us 50 grams.

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Answer:

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Average speed is 60 km/hr whereas average velocity is 0 km/ hr.

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