scientists are measuring 2 separate depths using sonar. point A takes 4 seconds to return. point b takes 8 seconds. how could the scientist find roughly the depth of the water? how do you know?

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s. when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?

Newtons view of arrangement of the universe. don't copy from anywhere.