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# A box of old textbooks is on the middle shelf in the bookroom 13 m from the floor If the janitor relocates the box to a shelf that is 26 m from the floor how much work does he do on the box The

A box of old textbooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the
box to a shelf that is 2.6 m from the floor, how much work does he do on the box? The box has a mass of 10 kg.
(A) 13 J (B) 26 J (C) 52 J (D) 130 J (E) 260 J
22. A mass, M, is at rest on a frictionless surface, connected to an ideal horizontal spring that is unstretched. A
person extends the spring 30 cm from equilibrium and holds it by applying a 10 N force. The spring is brought
back to equilibrium and the mass connected to it is now doubled to 2M. If the spring is extended back 30 cm
from equilibrium, what is the necessary force applied by the person to hold the mass stationary there?
(

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