An echo is a reflection of sound against another surface. Suppose you are standing on one side of a canyon and you yodeled. Suppose the temperature is 20°C and the canyon is 750 m wide, how long does it take for you to hear the echo
of your yodel?

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s.assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.