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Ask Your Teacher A 51-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.1 m/s. Neglect air res
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Ask Your Teacher A 51-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.1 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
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Physics
6 months
2021-08-17T11:52:45+00:00
2021-08-17T11:52:45+00:00 1 Answers
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Answers ( )
Answer:
6.11 N
Explanation:
Let,
m= mass of vaulter
Vi initial speed =11 m/s
Vf speed on pole (final) =1.1 m/s
Yi = initial height (when on ground)=o m
Yf = Height while crossing the pole =?
This problem can be solved by using conservation of energy rule;
KEi + PEi = KEf + PEf
==> 1/2 m
+ mg
= 1/2 m
+mg
Initially the altitude of vaulter is zero i-e
==> PEi = mg
= mg×0=0
==>1/2 m
= /2 m
+mg
==> m
=m
+2mg
cancelling m
==>
=
+2g
==>
–
=2g
==>
=
==> =
==>
=
=6.11N