[填空题]
A person going for a mor t:u+h ,sdit+kning jog on the deck ogv1, xxgnmb*3 f a cruise ship is running toward the bow ,gm g1bxnxv3*(front) of the ship at 2.2 $\mathrm{~m} / \mathrm{s}$ while the ship is moving ahead at 7.5 $\mathrm{~m} / \mathrm{s}$ . What is the velocity of the jogger relative to the water? m/s
Later, the jogger is moving toward the stern (rear) of the ship. What is the jogger's velocity relative to the water now? m/s
