Two blocks A and B each of mass 2kg are connected by a spring of spring constant k 300

Text Solution

There will be no compression or elongation in the spring if all surface are smooth There will be no compression or elongation in the spring if A is rough and B is smooth Maximum elongation in the spring `35 cm` If alll surface are smooth There will be no compression or elongation in the spring if A is smooth and B is rough

Answer : a,d

Solution : If initialy acceleration of A is greater than thet of R then there will be extension and if of B is greater than A then there will be compression in the spring otherwise the length the tength of spring will remain same

Text Solution

zero`2 m//s^(2)``6 m//s^(2)``8 m//s^(2)`

Answer : C

Solution : <img src="//d10lpgp6xz60nq.cloudfront.net/physics_images/ALN_AIIMS_NC_P1_E01_203_S01.png" width="80%"> <br> `kx=20N`,`N_(1)=8N`, <br> `f=4N`,`a=(16-4)/(2)=6 m//s^(2)`