A ball is held at rest at the top of a hill. The bail is then released and start

Question

A ball is held at rest at the top of a hill. The bail is then released and starts rolling down the hill. At the bol Map^it reaches level ground and keeps rolling along the ground. Defining the level ground as zero height, select from the list below what types of energy the bail has at the top of the hill: Gravitational Potential Energy Rotational Kinetic Energy Kinetic Energy Electrostatic Potential Energy Spring Potential Energy Select from the list below what types of energy the bail has halfway down the hill: Gravitational Potential Energy Kinetic Energy Rotational Kinetic Energy Electrostatic Potential Energy Spring Potential Energy Select from the list below what types of energy the bail has on the level ground: Electrostatic Potential Energy Gravitational Potential Energy Kinetic Energy Rotational Kinetic Energy Spring Potential Energy

Explanation / Answer

part a )

ball at rest

so only gravitational potential energy

PE = mgh

part b )

at halfway

h = h/2

ball rolling also

total energy = mgh/2 + mv^2/2 + KErot

ball has gravitaional potential energy , rotational energy , kinetic energy

part c )

at bottom

h = 0

sp only rotaonal and kinetic energy

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