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Calculate the acceleration due to gravity

  • Thread starter imy786
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  • #1
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Homework Statement



density, ρ of the rock is 4000 kg m−3 and that this density is uniform throughout. You have equipment that enables you to measure the time it takes for a small object to fall from rest through a distance of 2.00 m. Your measurement is 8.0 s.

(a) Calculate the acceleration due to gravity ga at the surface of the rock.
ga is constant for the drop in the experiment


Homework Equations



t=8
ρ=4000
s=2
a=?

s=ut+1/2 at2

The Attempt at a Solution



well i cant work out the acceleration as i dont know the velocity.
Need help on this...
 

Answers and Replies

  • #2
Dick
Science Advisor
Homework Helper
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It says "fall from rest". What does this tell you about the initial velocity?
 
  • #3
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t=8
ρ=4000
s=2
a=?
u=0

s=ut+1/2 at2
2= 32 a
a=0.0625 m/s2
 
  • #4
Dick
Science Advisor
Homework Helper
26,258
618
Sure, looks fine.
 
  • #5
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to how many significant figues should i give the answer to.....
if i have been given time and distance to 3.s.f...should i also give the final answer to s.3.f?
 

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