Bungee Jumper's Equilibrium and Turning Points

Steps:

• The jumper is momentarily at rest where velocity is zero, at the lowest point of maximum stretch (turning point).
• Acceleration is zero where net force is zero, at the equilibrium position where spring force equals weight.
• Assuming standard diagram: P is start, Q is equilibrium (mid-stretch), R is lowest point.
• Thus, rest occurs at R, zero acceleration at Q.

Why C is correct:

• C identifies rest at R (v=0 at maximum displacement) and zero acceleration at Q (F_net=0 per Newton's second law).

Why the others are wrong:

• A: Q,P confuses equilibrium with rest and start with zero acceleration.
• B: Q,R mismatches rest (not at Q) and zero acceleration (not at R, where a is maximum).
• D: R,R incorrectly places zero acceleration at the turning point.

Final answer: C