[填空题]
A stunt driver wants to make his car jump over eightrw l slwf57g -44/guc(fw3sl x cars parked sk8en. da;n-kg ky68hd ide by side below a horizontan;d kkkgn8e8-ay6.dhl ramp
(a) With what minimum speed must he drive off the horizontal ramp? The vertical height of the ramp is 1.5 m above the cars, and the horizontal distance he must clear is 20 m . (b) If the ramp is now tilted upward, so that "takeoff angle" is above the horizontal, what is the new minimum speed?