1.An object is released, 50m above the ground, from a hot air balloon, which is descending vertically at a
speed of 4.0m/s^2.
Calculate:
a. The velocity of the object at the ground
b. The duration of descent of the object
c. The height of the balloon above the ground when
the object hits the ground.

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line

What is the coefficient of kinetic friction μk between the block and the tabletop?

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.