Because a raindrop is "soft" and deformable, the collision duration is a relatively long  8.0  msms.  what is the mosquito's average acceleration, in  gg's,  during the collision? the peak acceleration is roughly twice the value you found, but the mosquito's rigid exoskeleton allows it to survive accelerations of this magnitude. in contrast, humans cannot survive an acceleration of more than  about 10  gg.