Entity motion is capped at 10 per axis

i can't put motion data more than 10 when summon entity minecraft
it summoned but it stay still idle not moving
my command is:

summon item 229 99 226 {Item:{id:"minecraft:stone",Count:1b},NoGravity:1,Tags:["bul"],Motion:[0.0d,0.0d,10.32d]}