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DrHughes
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20) An ideal spring is hung vertically from the ceiling. When a mass 2.0 kg hangs at rest from it, the spring is extended 6.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10cm. While the spring is being extended by the force, the work done by the spring is:
a) – 4.2 J
b) – 3.6 J
c) – 3.4 x 10-5 J
d) 3.6 J
e) 4.2 J
I know formulas like Fsp = 1/2 kx^2 etc .etc.
I still don't know how to put them to use in this context
a) – 4.2 J
b) – 3.6 J
c) – 3.4 x 10-5 J
d) 3.6 J
e) 4.2 J
I know formulas like Fsp = 1/2 kx^2 etc .etc.
I still don't know how to put them to use in this context