A spring has an unstretched length of 0.30 m and a spring constant of $$\(400 \mathrm{Nm}^{-1}\)$$. An object is suspended from the spring and the spring is deformed within its limit of proportionality. The new length of the spring is 0.50 m . What is the elastic potential energy stored in the spring?
A.
8.0 J
B.
16 J
C.
40 J
D.
50 J
Exam No：9702_w24_qp_11 Year：2024 Question No：22
Answer:
A
Knowledge points:
6.1.1 appreciate that deformation is caused by a force and that, in one dimension, the deformation can be tensile or compressive
6.1.2 describe the behaviour of springs in terms of load, extension, elastic limit, Hooke’s law and the spring constant (i.e. force per unit extension)
6.1.3 define and use the terms stress, strain and the Young modulus
6.1.4 describe an experiment to determine the Young modulus of a metal in the form of a wire
Solution:
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