(Solved): A section of track for a roller coaster consists of two circular arcs AB and CD joined by a straig ...

A section of track for a roller coaster consists of two circular arcs AB and CD joined by a straight portion \( B C \). The radius of \( A B \) is \( 27 \mathrm{~m} \) and the radius of \( C D \) is \( 72 \mathrm{~m} \). The car and its occupants, of total mass \( 170-\mathrm{Kg} \) reach point \( \mathrm{A} \) with practically no velocity and then drop freely along the track. Ignore air resistance and rolling resistance velocity at \( B(\mathrm{~m} / \mathrm{s}) \) a. \( 10.1 \) b. \( 8.42 \) c. \( 6.74 \) d. \( 5.05 \) ?. \( 3.37 \) normal reaction at \( \mathrm{B} \) velocity at \( D(\mathrm{~m} / \mathrm{s}) \) ?. \( 29.7 \) b. \( 35.64 \) c. \( 23.76 \) d. \( 41.58 \) e. \( 11.88 \) normal reaction at \( D(N) \)