Physics, 17.03.2020 01:21 pacpac1172
A person holds a 4.0 kg block at position A, 30 cm above ground, in contact with an uncompressed vertical spring with a spring constant of 500 N/m. the person gently lowers the block from rest at position A to rest at position B. which of the following describes the change in the energy of the block-spring-Earth system as a result of the block being lowered?
(a) The energy decreases by approx. 1.5 J
(b) The energy decreases by approx. 2.5 J
(c) The energy increases by approx. 4.0 J
(d) The energy of the system does not change.
Answers: 3
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A person holds a 4.0 kg block at position A, 30 cm above ground, in contact with an uncompressed ver...
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