Algodoo

a pump usually pumps upwards, but meh, it is a good scene

deze is ietsie realistischer, alhoewel geen vering, maarja, deze heeft wel lampjes

OMG, very nice

0.9 sec
with beta b15 you can edit velocity directly, so you can put a laser on the sled which multiplies the speed of the sled every ms.
( e.geom.vel=e.geom.vel * 1.3 )