A bar of gold has a temperature of 31°C, and a bar of aluminum has a temperature of 27°C. Which statement explains why the bar of aluminum has a lower temperature? A. The particles that make up the aluminum bar are moving more slowly B. The aluminum bar has more thermal energy C. The particles that make up the aluminum bar are moving faster D. The gold bar has a higher density than that of the aluminum bar

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?