A 10 year old girl should pitch about 40-55mph.
Should pitch at least 75 at high 80
Pitching a fast ball at 69 mph will not harm a 13 year old. A 13 year old should not be allowed to pitch a curve ball or any other pitch that may hurt his pitching arm. Curve balls should never be pitched by any boy under the age of 16.
38-45 mph
It depends on how much they practice and workout. So anywhere from 45-55 miles an hour.
fast.
Honestly, It depends on the girl. Some don't even pitch 40, while others pitch nearly 60.
They can usaly pitch about 50-60mph cause i am in softball and I am 12 and I pitch about 60-70mph
In my opinion, 12 year old shouldn't pitch the ball fast. Hard but not fast! In other words, don't hold back but don't strain either. You have plenty of time to develop speed once your body is developed. Concentrate on good fielding and ball contact when batting and your set for huge future in fpsoftball. A glove is 10 times better than a bat or a pitch.
Between 55 and 75 MPH
8 minutes
15 mph sprinting full speed is average for a 10 year old. Also, a 10 year old to run a mile in 9 min and 45 sec running as fast as they can.