The 8-kg collar has a velocity of 2 m/s to the right when it is at A. It then travels down along the smooth guide as shown in (Eigure 1). The spring has an unstretched length of 100 mm and B is located just before the end of the curved portion of the rod. Figure 200 mm k-50 N/m 17 200 mm 1 of 1 > Part A Determine the speed of the collar when it reaches point B. Express your answer to three significant figures and include the appropriate units. 0 Submit Part B Value HA Submit Request Answer Provide Feedback What is the normal force on the collar at this instant? Express your answer to three significant figures and include the appropriate units. N- Value HA Request Answer Units → ? Units ?

An ideal spring hangs from the ceiling. A 1.25 kg mass is hung from the spring, stretching the spring a distance d = 0.0865 m from its original length when it reaches equilibrium. The mass is then lifted up a distance L = 0.0325 m from the equilibrium position and released. What is the kinetic energy K of the mass at the instant it passes back through the equilibrium position? K = d Equilibrium position wwwwww. www

This, the length of the pendulum is 1.58 m. Now you start with the pendulum at 20.6 degrees with respect to the vertical, but rather than releasing it from rest, you give it a push downward. It swings to the other side, and reaches a maximum angle of 34.3 degrees with respect to the vertical. What must have been the initial speed of the pendulum just after you pushed it?     1.41 m/s     3.71 m/s     1.85 m/s     2.32 m/s

Please help me understand this practice problem.