I need help for physics please

5 mph, 90 meters per hour, 270 cm per hour

Explanation:

1. 5mph

20 x 0.5 = 10 miles

10 miles divided by 2 hours = 5 miles per hour

2.  90 meters per hour

20 minutes is 1/3 of an hour

30 x 3 = 90 meters in an hour

3. 5.5 cm per minute, 270 cm an hour

65-10 = 55 cm

55 / 10 = 5.5

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

cancer risk hope this