A 4 kg ball and an 8 kg ball are simultaneously launched with a speed of 10 m/s and at an angle of 40° to the horizon. If air resistance is negligible, which of the following best describes the flight time and horizontal range of the two balls? A) Both balls have the same flight time and range
B) The 8kg has a longer flight time and longer range
C) The 4kg ball has a longer flight time but both balls have the same range
D) The 4kg ball has a longer flight time and longer range

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?