Pretest: Unit 5 A bungee jumper who is about to jump has her energy stored entirely as
gravitational potential energy. After jumping, she bounces up and down. What
has happened to her initial gravitational potential energy when she reaches
equilibrium - that is, when she stops bouncing up and down?
O
A. Some of her initial energy has been transferred to potential energy
in the bungee cord.
B. Friction and air resistance have converted all of her initial energy
to heat and sound.
O c. She has regained all of her initial energy as gravitational potential
energy
O
D. The different energy types (gravitational potential, kinetic, and
spring potential) have balanced.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.