12. The speed of sound in air is 320 ms-1 and in water it is 1600 ms-1 . It takes 2.5 s for sound to reach a certain distance from the source placed in air.
a. Find the distance.
b. How much time will it take for sound to travel the same distance when the source
is in water?

Mark saxby is set to kick the field goal to win the state championship for olathe east. he is 47m away from the goalposts, and he kicks the ball at a speed of 25.0m/s at an angle of 30.0°. if the cross bar on the goalposts is 3.00m above the ground, will the ball make it over the cross bar? and if it does make it, by how much will it clear?