SAT® Subject Test in Physics

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Difficult

Top of Roller Coaster Loop

SATPHY-QJQT5U

A man is sitting on a roller coaster and is at the top of a circular loop (He is upside down at this point.) where he is pushing against his seat with a force that is exactly equal to his weight.

What is his vertical acceleration at this point, in terms of $g,$ the acceleration of gravity?

A

$g$ downward

B

$g$ upward

C

$2g$ downward

D

$2g$ upward

E

$0 g$