[问答题]
A block of mass m is attached to the end of a spring
l s,, qjvm;c6 4dnznc-(spring stiffn
/9c-( dg y .xmq hid7wbkpakn 12e*b3oess constant k), Fig. 6–40. The block is given
.ako/3h yqc-ix9wbd d2 ngb1*mp ( k7ean initial 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
