Two identical 1 kg rocks are held 1 m above the surface of the Earth (g = 10 m/s2) and moon (g = 1.6 m/s2) . Just as they are released, which rock has more potential energy? A.
The rock on the Earth has more potential energy because it is farther from the center of the Earth than the rock on the moon is from the center of the moon.

B.
The rock on the Earth has more potential energy because the acceleration due to gravity on Earth is greater than the acceleration due to gravity on the moon.

C. They have the same potential energy because they are the same height off the ground.

D. They have the same potential energy because they have the same mass.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 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. the block's initial mechanical energy is 9.472 j.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.