What is most likely the reason the author included the description of the spoon in the hot coffee cup? A. To indicate that heat transfer always requires a liquid and a solid to work together

B. To explain the process of heat transfer by conduction through an everyday situation

C. To provide advice about using conduction to quickly cool down a hot beverage

D. To compare the effectiveness of heat transfer in liquid with heat transfer in air

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?