Japanese · Pronunciation Guide
ku-sa, two beats — the first vowel usually whispers, so it can sound like "k'sa."
kusa
Two beats, the first typically voiceless. That whispered mora still takes its full time, so the word has an audible run of friction at the front rather than a consonant cluster — the difference between "k'sa" with a gap and "ksa" without one.
Listen: 草
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子供たちが草の上で遊んでいます。
Kodomotachi ga kusa no ue de asonde imasu.
The children are playing on the grass.
Listen: 子供たちが草の上で遊んでいます。
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子供たちが草の上で遊んでいます includes 遊んで, where the bu becomes a moraic nasal (a-so-n-de). So the sentence has a whispered vowel near the start and a hum near the end, both of which occupy full beats that English wouldn't count.
"KOO-sa" rounds and voices the first vowel and stresses it. Spread the lips, let it devoice, and keep the timing at two even counts. Learners who overcorrect and drop the beat entirely produce a one-syllable "ksa," which is just as wrong in the other direction.