↑ F_N ≈ 688 N │ (normal force) │ ────────────■──────────── ramp (34.8°) ↗ [ BOX ] ↘ ↓ mg ≈ 838 N (weight) ←─────────────── F_f ≈ 205 N (friction, down ramp) ──────────────→ F_push = 736 N (Cory 379 N + Kathy 357 N, up ramp)