A 1 kg block is attached to a spring with a constant of 100 N/m. The spring is displaced 0.1 m from equilibrium. When the block is let go, what is its velocity as it passes the equilibrium point? 4.0 m/s 0.4 m/s 1.6 m/s 2.0 m/s 1.0 m/s

7. The spring is compressed by the mass (m= 2 kg) to half of its original length and then released. The surface is not smooth and has coefficient of friction 0.2. What will be its speed after 2 s. The spring constant is 200 N/m and the unstretched length of the spring is 60 cm.The mass is not connected to the spring and it can slide on the surface after it is released after compression. k m x = 0

A horizontal spring attached to a wall has a force constant of 890 N/m. A block of mass 1.40 kg is attached to the spring and oscillates freely on a horizontal, frictionless surface as in the figure below. The initial goal of this problem is to find the velocity at the equilibrium point after the block is released. x= 0 (a) x= 0 PE, = KE= 0 (b) X=0 PE, = 0 !! (c) (a) What objects constitute the system, and through what forces do they interact? (b) What are the two points of interest? (c) Find the energy stored in the spring when the mass is stretched 5.00 cm from equilibrium and again when the mass passes through equilibrium after being released from rest. x = 5.00 X = 0 J (d) Write the conservation of energy equation for this situation and solve it for the speed of the mass as it passes equilibrium. (Do this on paper. Your instructor may ask you to turn in this work.) (e) Substitute to obtain a numerical value. m/s

SSN 11. When a 0.34-kg block is suspended on a vertical spring, it causes it to stretch 3.20 cm. If the block is now pulled 7.80 cm below its equilibrium position and released, what is the speed of the block when it is 1.40 cm above the equilibrium position? m/s 160 ssf60 ssf60 ss of the f60 ssf60* 0 ssf60 ss 09J$$