[填空题]
Suppose a car manufacturer tw m lfh07clm:.*9gdwqested its cars for front-end collision wn t*+dj5thnwx7 o0j;4n tn,os by hauling them up on a crane andnjw+x ; *4o twhjn5t7,0nntdo dropping them from a certain height.
(a) Show that the speed just before a car hits the ground, after falling from rest a vertical distance H, is given by $\sqrt{2gH}$ . What height corresponds to a collision at
(b) 60 km/h ? $\approx$ m (Round to the nearest integer)
(c) 100 km/h ? $\approx$ m (Round to the nearest integer)
