Question

A mass of m = 0.250 kg is attached to the end of a massless spring of unknown spring constant. The mass is dropped from rest at point A, with the spring initially unstretched at a length of l1 = 1.50 m. As the mass falls, the spring stretches to a length of l2 = 2.30 m. At point B the mass is as shown in the diagram. (a) Given that the velocity vf = 5.80 m/s, find the force constant of the spring. (b) Find the acceleration of the mass at point B. (Define the positive direction to be upward.)

          A mass of m = 0.250 kg is attached to the
end of a massless spring of unknown spring constant. The mass is
dropped from rest at point A, with the spring initially unstretched
at a length of l1 = 1.50 m. As the mass falls,
the spring stretches to a length
of l2 = 2.30 m. At point B the mass is as shown
in the diagram. (a) Given that the
velocity vf = 5.80 m/s, find the force constant
of the spring. (b) Find the acceleration of the mass at point
B. (Define the positive direction to be upward.)

Added by Miriam E.

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