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The projectile of the blow gun is aimed at the block on a rolling cart
 a hole in one side has putty to hold the pellet, or use the pellet with sharp point
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If it sticks, the impulse to the block 
p=mv
This is the inelastic case:
Vblock
p/m=(m/M)*V
If the block is turned, the pellet rebounds elasticly
p=2mv
Vblock(elastic)=2(m/M)V=2Vblock(inelastic)
The distance the cart rolls is a measure of Vblock
| V²=Vo²+2as s=V²/2a |
V=0 Vo=Vblock |
Inelastic si=Vin²/2a |
Elastic se=4Vin/2a |
The block should roll 4X as far, but in practice it is about 2.5X
