[问答题]
A block of mass m is attachs c0at uvup)*ev*)3je 7eynw e08 a0kced to the end of a spring (spring stiffness constant k), Fig. 6–40. The block is given an i7 ny0kec8wea0 nitial displacement $x_0$ after which it oscillates back and forth. Write a formula for the total mechanical energy (ignore friction and the mass of the spring) in terms of $x_0$ position x, and speed
