an 85-kilogram skydiver performs a free fall from a stationary helicopter at a height of one mile. what is the estimated resulting velocity of the free fall considering the man fell for a half a mile before pulling his parachute

Answermake them get very hot and over time wear them out;

The correct option is this: the sound waves from the two trombones have slightly different frequencies.from the question given above, we are told that the loudness of the sounds were increasing and decreasing, this is because the frequencies of the two sounds are different. the means that the number of waves that pass a fixed point in a given amount of time differ for both sounds.