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Can you please check if my answers are correct?

  1. Oct 26, 2009 #1
    1. The problem statement, all variables and given/known data
    An object starts from rest w/ a constant acceleration of 8m/s^2 along straight line.
    a)find the speed at the end of 5 sec.------40sec
    b)the ave. spped for the sec interval------20m/s

    A stone is thrown vertically upward w/ an initial velocity of 49m/s
    a)How long does it take to reach the highest point-----5 sec
    b)How far does the stone go---122.5m
    c)How fast does the stone go----4.52s

    A stone is dropped from a bridge w/c is 60m above seal level. a)find the time before it hits the water----12.24s
    b)Speed upon hitting the water---34.29m/s

  2. jcsd
  3. Oct 27, 2009 #2


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    Hi honestliar! :smile:

    They're ok except for …
    (and I don't understand the question "c)How fast does the stone go" :confused:)
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