- #1
bob29
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Homework Statement
Question: "A block of 2kg mass is hanging from a spring with stiffness K=70N/m. The spring has an unstretched length of 30cm. The mass oscillates vertically under the influence of the spring and gravity. Calculate the magnitude and direction of the mass's acceleration when:
a) x=40cm
b) x=75cm
Homework Equations
F = -kx
x = (L' - L) where L = unstretched
F = ma
F = mg
The Attempt at a Solution
part a) F= -KX, F= -70*(0.4-0.3) = -7N, F=ma where F= -7N so a=m/F = (-3.5)j N,
direction of A is downward @ a magnitude of (3.5+9.8)ms^-2
part b) same as part a with the number change.
Not sure if it's correct, would like to know where I went wrong.
Cheers,