Objects in space question 12 options: require energy to move because they have mass do not require energy to move because there is no gravity stop on their own move on their own

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Aphysical change is a change in the size, shape,, or stafe of matter true or false

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference