試題詳解

7. A block of mass oscillates at the end of a horizontal spring on a frionless surface. Al maximum extension,an identical block drops onto the top of the first block and sticks to it. How does the new period Tnew compare to the original period,T₀? 
(A) Tnew = 0.5 T₀
(B) Tnew = T₀
(C) Tnew = √2 T₀
(D) Tnew = 2 T₀
(E) Tnew = 3 T₀