how much current does it used per 5 meter a 24V?

DC24V3A is enough for DC24V 5meters FCOB LED strip https://www.amazon.com/dp/B09T6QQ2W5?ref=myi_title_dp

Does the brightness decrease along the length of the strip and if so, can power be injected at other places to reduce the brightness drop-off?

Yes ,the brightness decrease along the length of the LED strip . The LEDs at the far end of the strip might be dimmer because of the added resistance and voltage drop that occurs as the current flows to that end of the strip.This is a normal physical phenomenon, and all the LED strip cannot avoid this problem. The factors that affect brightness are： 1.Length . If your project is too long , the voltage drops . 2.Power supply . Make sure the power is enough for the project . 4.Brightness. The brighter the brightness, the more the consumption 5.LED quantity . More LEDs ,need more power . Solution： 1.Adding voltage every 5 meters (16.4ft) . 2.Lower brightness 3.Enough power 5.Using DC24V LED strip. 6.Less LEDs You can use DC24V or this kind of sigal amplifier : https://www.amazon.com/LEDENET-Single-Amplifier-Repeater-Channel/dp/B01LY7M712/ref=sr_1_3?crid=3UIQ04SAZ6I9L&keywords=single+color+signal+amplifier&qid=1656645595&sprefix=single+color+signal+amplifie%2Caps%2C297&sr=8-3

Manufacturer	BTF-LIGHTING Technology Co., Limited
Item model number	FCOB-12V-336L-W-IP30
Product Dimensions	15 x 1.5 x 15 cm; 40 g
ASIN	B0828YGB39

BTF-LIGHTING FCOB COB Flexible High Density Uniform Light LED Strip 8W/m 16.4FT DC12V Warm White 3000K CRI 90+ 8mm Width Dimmable LED Ribbon for Bedroom Kitchen Home Indoor Decoration

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