Which statements are true? (more than one statement) A) Energy is required to do

Question

Which statements are true? (more than one statement)

A) Energy is required to do work.
B) Without friction, the sum of the potential and kinetic energies of a body is constant.
C) Energy conservation law for a projectile (no friction): Potential energy increase equals the kinetic energy decrease.
D) Less power is required while slowly lifting a box than while lifting it up quickly.
E) Work is done when the form of energy changes.
F) Work can be done in the absence of motion. Which statements are true? (more than one statement)

A) Energy is required to do work.
B) Without friction, the sum of the potential and kinetic energies of a body is constant.
C) Energy conservation law for a projectile (no friction): Potential energy increase equals the kinetic energy decrease.
D) Less power is required while slowly lifting a box than while lifting it up quickly.
E) Work is done when the form of energy changes.
F) Work can be done in the absence of motion.

Explanation / Answer

a) true

b) true

c)true

d)true

e)false

f)false

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