Will I be able to react in time?

 

The drought down south means that the trees are shedding leaves sooner than expected. I was lying in the shade under this conker tree and hoping that the conker directly above my head wasn't about to drop. Would I be able to react in time? It was 3 metres above me. Using s=ut+1/2at^2 means that it would take 0.8 seconds to fall on me. If my reaction time is 0.2 seconds I might just be able to take evasive action.