A Roller coaster  is  desigend  such  that  riders  experience  "Weightlessness
Channel: Doubtnut
Date: 2020-05-24

A Roller coaster  is  desigend  such  that  riders  experience  "Weightlessness " as  they  go round  the top  of a hill  whose  radius  of curvature  is 20 m. The  speed  of the  car  at the  top  of the  hill  is between