As shown, object A and B with mass of m1 and m2 are put on a smooth surface of a table and they are connected through a light spring. Another two objects C and D are on objects A and B, and the frictional factors between A and C, B and D are not equal to zero. An external force pushes on A and B along the horizontal direction and the spring is compressed. As removing the external force during the process of A and B being apart away, for the system of A, B, C, D and the spring we have( )
选项:
A:Both momentum and mechanical energy are conserved;;
B:Momentum is not conserved while mechanical nergy is conserved;;
C:Both momentum and mechanical energy are not conserved;;
D:Momentum is conserved , while mechanical energy is not necessarily conserved.
发布时间:2024-04-24 19:50:46