In وَأَقِيمُوا الصَّلَاةَ, the final madd wāw of the first word would meet the following sākin after the hamzat al-waṣl is omitted in connected reading.
The madd sound is therefore dropped in liaison. If instead you stop on وَأَقِيمُوا, you are not performing that same junction. Listen for the difference between an isolated word and the joined phrase.
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Example: wa-aqīmū ṣ-ṣalāh
Meeting of Two Sākin Letters — ʿAlā Ḥaddih, Ghayr Ḥaddih and Tanwīn
In وَأَقِيمُوا الصَّلَاةَ, the final madd wāw of the first word would meet the following sākin after the hamzat al-waṣl is omitted in connected reading.
The madd sound is therefore dropped in liaison. If instead you stop on وَأَقِيمُوا, you are not performing that same junction. Listen for the difference between an isolated word and the joined phrase.