Problem: Consider the two spheres shown here, one made of silver and the other of aluminum. The spheres are dropped from a height of 2.1 m.What is the kinetic energy of the silver sphere at the moment it hits the ground? (Assume that energy is conserved during the fall and that 100% of the sphere’s initial potential energy is converted to kinetic energy by the time impact occurs.)

FREE Expert Solution

PE = m×g×hPE =(2.70 gcm3×196 cm3×1 kg103 g)(9.8 ms2)(2.1 m)

PE = 10.89 J


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Problem Details

Consider the two spheres shown here, one made of silver and the other of aluminum. The spheres are dropped from a height of 2.1 m.

The aluminum sphere has a composition equal to aluminum, a density equal to 2.70 grams per cubic centimeter, and a volume equal to 196 cubic centimeters. The silver sphere has a composition equal to silver, a density equal to 10.49 grams per cubic centimeter, and a volume equal to 196 cubic centimeters.


What is the kinetic energy of the silver sphere at the moment it hits the ground? (Assume that energy is conserved during the fall and that 100% of the sphere’s initial potential energy is converted to kinetic energy by the time impact occurs.)

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