Abird has a mass of 0.2 kg and is flying 10 m above the ground with a speed
of 7 m/s. what is the total mechanical energy of the bird? acceleration due to
gravity is g = 9.8 m/s2

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?