140s Classroom → 35s Sub-90 Target27-Q Physics Mock
Archetype Sub-90 Dry-Wipe Invariant (Hooke's Law, Springs in Series (½k) vs. Parallel (2k) & Elastic Potential Energy (½kx^2)): Spring stiffness behaves OPPOSITE to resistors: two identical springs in parallel are stiffer (k_eff = 2k, half the extension); in series they are softer (k_eff = k/2, double the extension). Always compute x = |L - L₀| first.
sub90 ESATARCH-P-07: Hooke's Law, Springs in Series (½k) vs. Parallel (2k) & Elastic Potential Energy (½kx^2)Physics
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SUB-90 ZONE (<40S)
0.0s40s Sub-9090s ESAT Budget150s Classroom
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