(Solved): A roller coaster starts from rest at A, rolls down the track to B; describes a circular loop of 12 ...

A roller coaster starts from rest at $A$, rolls down the track to $B$; describes a circular loop of 12 -m diameter, and travels up and down past point $E$. Assume that there is no energy loss due to friction. Given: $h=20\mathrm{m}$. Determine the force exerted by the seat on a $60\mathrm{kg}$ rider at $B,D$, and $E$ The force exerted by the seat at $B$ is N The force exerted by the seat at $D$ is N The force exerted by the seat at $E$ is N.