A roller-coaster car carrying passengers crests the top of a circular arc of radius

PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

20\,\text{m}

. Neglecting friction, what minimum speed must the car have at the top so that the passengers just begin to feel weightless? (a)

20\ \text{m/s}

(b)

10\ \text{m/s}

(c)

14\ \text{m/s}

(d)

28\ \text{m/s}