[填空题]
A 2.00-kg pumpkin oscillates from a verticfkpo3+ su,*pya0;q udally hanging light spring once c,m ut ie+*g875xuvjnevery 0.x,tuig7v u* +em85n jc65 s.
(a) Write down the equation giving the pumpkin’s position y (+ upward) as a function of time t, assuming it started by being compressed 18 cm from the equilibrium position (where ), and released. y = ( m)cos($\frac{2\pi t}{0.65s}$)
(b) How long will it take to get to the equilibrium position for the first time? s
(c) What will be the pumpkin’s maximum speed? m/s
(d) What will be its maximum acceleration, and where will that first be attained? $m/s^2 $
