Which as more weight a kilogram of bricks in air or a kilogram of feathers in water? explain your answer.

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.

What are two different ways you could find the value of a? explain these methods.

The ozone hole appears in antarctica during