A ball of mass m is dropped from a height h on a massless platform fixed at the top of a vertical spring as shown below. The platform is depressed by a distance x. What will be the value of the spring constant?
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Given
m = Mass of block
h = Displacement of platform
x = Displacement of spring
To find
Spring constant (k)
Solution
g = Acceleration due to gravity
The potential energy of the object and potential energy of the spring balance each other. In other words the energy of the system is conserved.
Therefore the spring constant is .
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Answer:
The particle is dropped from height h and the spring be compressed by x.
Loss in PE of the particle = gain in elastic PE of the spring
mg(h+x)= 1/2 kx^2 ⇒ k = 2mg(h+x)/x^2
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