Homework Help: Repost-Physics 1

Posted by John on Tuesday, October 9, 2012 at 9:18pm.

Consider a roller coaster that moves along the track shown in the figure below. Assume all friction is negligible and ignore the kinetic energy of the roller coaster's wheels. Assume the roller coaster starts with a speed of
19 m/s at point A. Find the speed of the roller coaster when it reaches locations B and C.(Assume hA = 40 m and hB = 20 m.)
VB=____m/s
VC=____m/s

Repost-Physics 1 - Elena, Wednesday, October 10, 2012 at 5:14pm
KE(A)+PE(A)=KE(B)
mv(A)²/2 +mgh(A)= mv(B)²/2
v(B)=sqrt[v(A)²+2gh(A)] =
=sqrt[19²+2•9.8•40) =33.84 m/s
KE(B)+PE(B)=KE(C)
mv(B)²/2 +mgh(B)= mv(C)²/2
v(C)=sqrt[v(B)²+2gh(B)] =
=sqrt[33.84²+2•9.8•20) =43.92 m/s

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