An ambulance is traveling north at 64.4 m/s, approaching a car that is also traveling north at 33.7 m/s. The ambulance driver hears his siren at a frequency of 554 Hz.
At what frequency does the driver of the
car hear the ambulance’s siren? The velocity
of sound in air is 343 m/s. Answer in units of Hz.

Aprojectile is launched from ground level with an initial velocity of v 0 feet per second. neglecting air resistance, its height in feet t seconds after launch is given by s equals negative 16 t squared plus v 0 t. find the time(s) that the projectile will (a) reach a height of 192 ft and (b) return to the ground when v 0equals112 feet per second. (a) find the time(s) that the projectile will reach a height of 192 ft when v 0equals112 feet per second. select the correct choice below and, if necessary, fill in the answer box to complete your choice.