Asked by Nathan
You throw a 5.5 g coin straight down at 4.0 m/s from a 25-m-high bridge.
A) How much work does gravity do as the coin falls to the water below?
B)What is the speed of the coin just as it hits the water?
A) How much work does gravity do as the coin falls to the water below?
B)What is the speed of the coin just as it hits the water?
Answers
Answered by
bobpursley
a. mass*g*height
b. KE at bottom= mgh+1/2 m vi^2
= m(25*9.8)+m (1/2*16)
but KE at bottom=1/2 m vf^2
so vf=sqrt (2*25*9.8 +16)
b. KE at bottom= mgh+1/2 m vi^2
= m(25*9.8)+m (1/2*16)
but KE at bottom=1/2 m vf^2
so vf=sqrt (2*25*9.8 +16)
Answered by
Vaati
A:(5.5g)(9.81m/s^2)(50m)+ 2698g*m^2/s^2
B:32m/s
B:32m/s
Answered by
Vaati
A:(5.5g)(9.81m/s^2)(50)=2698g*m^2/s^2
Answered by
Ettienne
30m/s
Answered by
Abby
A) Mass X g X height
Change the mass into kg
(.0055) X 9.8 X 25
Change the mass into kg
(.0055) X 9.8 X 25
Answered by
Jacob
Do not forget to convert the grams to kg to get the right answer.
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