While leaning out a window that is 7.40 m above the ground, you drop a 0.600-kg basketball to a friend at ground level. Your friend catches the ball at a height of 1.10 m above the ground. Determine the following.
(a) the amount of work done by the force of gravity on the ball
W = J

(b) the gravitational potential energy of the ball-Earth system, relative to the ground when it is released
U0 = J

(c) the gravitational potential energy of the ball-Earth system, relative to the ground when it is caught
Uf = J

(d) the ratio of the change (Uf − U0) in the gravitational potential energy of the ball-Earth system to the work done on the ball by the force of gravity
ΔU
W=

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

Which levels of government establish and implement educational requirements for minors

What organization and environment is described above?