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OfflineViki
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Registered: 09/01/04
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Last seen: 19 years, 6 months
Physics Help
    #3080446 - 09/01/04 10:44 PM (19 years, 6 months ago)

I need some major help on two problems on my physics homework.

A ball is dropped from a 100 m tall cliff. How far does it fall during the first second? How far does it fall the second second?

An automobile slowly accelerates from a speed of 5 m/s to a speed of 20 m/s in a time of ten seconds. What is the car's average speed during this time?

Thanks!

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InvisibleSuffer
puter dork
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Registered: 03/05/99
Posts: 1,090
Loc: MA
Re: Physics Help [Re: Viki]
    #3080573 - 09/01/04 11:40 PM (19 years, 6 months ago)

1)
  a) 5 m
  b) the trick with this question is prolly the wording... so its 15 m, because you subtract how far it fell during the first second.

blah... i dont wana do all your homework for you  :grin:


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OfflineHarveyWalbanger
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Registered: 06/24/02
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Re: Physics Help [Re: Viki]
    #3083069 - 09/02/04 02:00 PM (19 years, 6 months ago)

the ball falls 9.8 m/s/s. then 19.6 m/s/s

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Invisibleoneducktwoducks
Registered: 12/13/02
Posts: 2,321
Re: Physics Help *DELETED* [Re: Viki]
    #3083154 - 09/02/04 02:27 PM (19 years, 6 months ago)

Post deleted by oneducktwoducks

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Anonymous

Re: Physics Help [Re: oneducktwoducks]
    #3084856 - 09/02/04 09:46 PM (19 years, 6 months ago)

this place is good.

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Offlinedeff
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Re: Physics Help [Re: Viki]
    #3088304 - 09/03/04 04:41 PM (19 years, 6 months ago)

1) 9.8 m
2) 19.6 m
3) 17.5 m/s

The third one seems too easy to be right. Maybe I missed something.


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Invisibleoneducktwoducks
Registered: 12/13/02
Posts: 2,321
Re: Physics Help *DELETED* [Re: deff]
    #3088325 - 09/03/04 04:47 PM (19 years, 6 months ago)

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Offlinedeff
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Re: Physics Help [Re: oneducktwoducks]
    #3088798 - 09/03/04 06:42 PM (19 years, 6 months ago)

Ah I'm stupid. 9.8 and 19.6 m/s would be the speeds, not the distances.

Answers:

1) 4.7 m
2) 19.4 m (total) or 14.7 m (just for the 2nd second interval)


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