What is the density of free electrons in the metal? ?

How would doubling the made of an object change the objects potential energy

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

Drag each tile to the correct box. tiles bra i sequence