I"ve never played angry birds but know it"s something to do with throwing birds, I guess that"s what makes them angry. We are not going to throw the birds but we"ll release them one at a time from a moving truck, this will make them a bit cross but not exactly angry.The birds in question can fly at 5 ms-1 in still air. They are released one at a time from a truck travelling due North along a straight road at 2ms-1 ....