ok heres the deal. we have to make a tennis ball launcher capable of firing a tennis ball at the same speed everytime. it also has to be able to fire anywhere from 0 to 90 degrees.
heres the tricky part. we can use anything but gas, flame, or chemicals. so we need like a slingshot or catapult design or something really creative. anyone with plans? help, anyone, or find me something on the net. i cant find anything