# PhysicsWatch

#1
How to solve the question below?
Q. A light spring is suspended from a rigid support and its free end carries a mass of 0.40 kg,which produces a static extension of 0.60 m in the spring. The mass is pulled down a further 0.60 m and released. The mass then oscillates with simple harmonic motion. By considering all the energy changes involved, calculate the kinetic energy of the mass as it passes through the mid-point of its motion.
0
4 weeks ago
#2
The first line of the question lets you calculate k (spring constant).Then the second line lets you calculate the elastic potential energy at the start ....Hope that helps.
0
#3
(Original post by old_teach)
The first line of the question lets you calculate k (spring constant).Then the second line lets you calculate the elastic potential energy at the start ....Hope that helps.
I need to find force in order to calculate the spring constant. F=ma. But what is the value of a in this case ??
0
4 weeks ago
#4
The first line of the question is a static extension (not SHM) where you need to use W = mg.
0
#5
(Original post by old_teach)
The first line of the question is a static extension (not SHM) where you need to use W = mg.
Thank you so much.
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