A 50.0 cm long spring with spring constant 237 N/m has a mass 1.8 kg attached to it, and it can oscillate on a horizontal table without any friction. The spring is pulled by a distance 5 cm from the resting position and released. What is the kinetic energy (in joules) of the mass at the instant when the length of the spring is 49 cm.

A block of mass 2.40 kg is placed against a horizontal spring of constant k = 885 N/m and pushed so the spring compresses by 0.0400 m.   (a) What is the elastic potential energy of the block-spring system (in J)? J (b) If the block is now released and the surface is frictionless, calculate the block's speed (in m/s) after leaving the spring. m/s

A spring has a force constant of 18.9 N/m and a rest length of 0.35 m.The spring is stretched to a length of 1.2 m and attached to a mass of 0.45 kg. When the spring is released, what is the speed of the mass when the spring has contracted to 0.70 m long?

A 500 g block on a frictionless horizontal surface is attached to a spring with spring constant of 12.5 N/m. The block is pulled to x = -20 cm and released at t =0. Find speed at x = 16.8 cm using energy conservation.

A 1100 kg safe is 2.0 m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 60 cm . What is the spring constant of the spring?

A block of mass 3.20 kg is placed against a horizontal spring of constant k = 725 N/m and pushed so the spring compresses by 0.0550 m. HINT (a) What is the elastic potential energy of the block-spring system (in J)? (b) If the block is now released and the surface is frictionless, calculate the block's speed (in m/s) after leaving the spring. m/s

The fair is in town and one of the attractions is a bungee jump. They are trying to determine the safety restrictions to prevent an accident. The length of the cord is 6.3m. The maximum distance of the fall is H=31 m, and the spring constant is K=145N/m. Given this information, what is the largest mass of jumper this attraction can allow?

A spring with spring constant k = 190 N/m is suspended vertically with its upper end fixed to the ceiling and its lower end at position y = 0. A block of weight 21 N is attached to the lower end, held still for a moment, and then released. If K = the kinetic energy, ΔUg = the change (from the initial value) in the gravitational potential energy, and ΔUe = the change in the elastic potential energy... What are (j)K, (k) ΔUg, and (l) ΔUe when y = –20 cm?

A moving 2.90 kg block collides with a horizontal spring whose spring constant is 327 N/m.The block compresses the spring a maximum distance of 12.00 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.400. What is the work done by the spring in bringing the block to rest? How much mechanical energy is being dissipated by the force of friction while the block is being brought to rest by the spring? What is the speed of the block when it hits the spring?

A 7.0-kg box slides along a horizontal frictionless floor at 1.7 m/s and collides with a relatively massless spring that compresses 23 cm before the box comes to a stop. (a) How much kinetic energy does the box have before it collides with the spring? (b) Calculate the work done by the spring. (c) Determine the spring constant of the spring.