Asked by Brooke
A child swings from a rope of length L. If she starts her swing with the rope horizontal what is her acceleration at the bottom of the swing?
a. 2gL^2
b. g/2
c. g
d. 2g/l
e. 2g
a. 2gL^2
b. g/2
c. g
d. 2g/l
e. 2g
Answers
Answered by
bobpursley
ke at bottom=PE at top
1/2 m v^2=mgh
1/2 v^2=gL
v^2=2gL
but acceleration=v^2/r=2g
1/2 m v^2=mgh
1/2 v^2=gL
v^2=2gL
but acceleration=v^2/r=2g
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