An Elevator Is Rising at Constant Speed

question 36

Multiple Choice

An elevator is rising at constant speed.Consider the following statements: I.the upward cable force is constant
II.the kinetic energy of the elevator is constant
III.the gravitational potential energy of the Earth-elevator system is constant
IV.the acceleration of the elevator is zero
V.the mechanical energy of the Earth-elevator system is constant

• A)all five are true
• B)only II and V are true
• C)only IV and V are true
• D)all but III are true
• E)only I, II, and IV are true

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