The article suggests a "modest" speed of 40mph for the quadrocopter, which seems pretty fast to me. Let's call it 30mph. Our car on the freeway is doing say 60mph. Presuming they're travelling in opposite directions, that's 5lbs travelling at 100mph.
So what you're saying is that if I fire a MacBook Pro at car at 100mph then nothing will happen. Unlikely...
And one of these smacking a pedestrian in the head at 40mph isn't going to be much better.
Depending on the design of the frame. Some are made of plastic and break apart really easy on impact. None of them, even the the aluminum frames, are even close to as dense as a MacBook.
So what you're saying is that if I fire a MacBook Pro at car at 100mph then nothing will happen. Unlikely...
And one of these smacking a pedestrian in the head at 40mph isn't going to be much better.