14. It is found that a force of 18 N is required to stretch a spring by 0.300 meters from its natural length. (a) What is the spring constant of the spring? (b) How much energy is stored in the spring when it is stretched by 0.125 meters from its natural length? (c) If the spring is laid horizontally and a 0.250 kg mass is attached to it while initially stretched by 0.125 m, What speed will the mass have after traveling 0.100 m due to the force exerted by the spring? (Assume the mass is in contact with a horizontal, frictionless surface) Answers: (a) 60 N/m (b) 0.469 J (c) 1.90 m/s

A spring lies on a horizontal table, and the left end of the spring is attached to a wall. The other end is connected to a box. The box is pulled to the right, stretching the spring. Static friction exists between the box and the table, so when the spring is stretched only by a small amount and the box is released, the box does not move. The mass of the box is 0.75 kg, and the spring has a spring constant of 77 N/m. The coefficient of static friction between the box and the table on which it rests is us = 0.59. How far can the spring be stretched from its unstrained position without the box moving when it is released?

A mass of 0.75 kg is suspended from a spring. If 1.41 J of work is done against the spring as the mass is pulled 0.15 m away from its equilibrium position, what is the spring constant of the spring?

A marble with a mass of 0.085 kg compresses a spring 5.1 cm. If the spring has a constant k = 150 N/m, what will the velocity of the marble be when it's released?