A rifle fires a 1.96 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 9.11 x 10-2 m from its unstrained length. The pellet rises to a maximum height of 6.17 m above its position on the compressed spring. Ignoring air resistance, determine the spring constant.

Sound energy is produced when an object vibrates. examples are 1- a balloon popping2-a whistle3- a waterfall

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

Answershe should not have multiplied the sulfur atoms by the subscript 4