[问答题]
A block of mass m is attached to the end of a spring (sprvyip7 5rj+xx 20xo9ix ing stiffnes. :jvu)8quagcz k7 4dcs constant k), Fig. 6–40. The block is given an initial displacemencc7q g.u j4adk8zu:) vt $x_0$ 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
