An unspecified force causes a 0.20-kg object to accelerate at 0.40 m/s2. if 0.30 kg is added to the 0.20-kg object and the force remains the same, what is the acceleration (in m/s2) of the heavier object? (never include units with the answer to a numerical question.)

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?