The Raptor is an outside loop roller couster in which rikkers are belted into scats resembling ski$-$lift chairs If the cars travel al $20=4\frac{m}{s}$ when they ore af the top of the hill. determine their speed when they are at the top of the loop and the reaction of the $7-$kg passenger on his weat at this instant. The car has a mass of $50kg.$ Take $h=12m,p=5m.$ Neglect friction and the sire of the car and passenger.

$($Hint: Total mass is $50kg+70kg=120kg)$

$v1=N=$