Changing tumble overhead at fixed run displacement shows drift as displacement over total time. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

One second tumbles leave one metre per second drift

The run ledger still gives 24 m over 8 cycles. With run time 2 s and tumble time 1 s, total time is 24 s.

24/24=124/24=1
Run tumble drift ledgerBiased runs plus run/tumble timing determine drift speed.drift speed16/24 s

Two second tumbles lower drift to three fourths

Tumble time rises to 2 s. Total time becomes 32 s, so drift is 3/4 m/s.

24/32=3424/32=\frac{3}{4}
Run tumble drift ledgerBiased runs plus run/tumble timing determine drift speed.drift speed16/32 s

Four second tumbles lower drift to one half

With tumble time 4 s, total time reaches 48 s and drift drops to 1/2 m/s.

24/48=1224/48=\frac{1}{2}
Run tumble drift ledgerBiased runs plus run/tumble timing determine drift speed.drift speed16/48 s