A set of 
identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is 
. The block at one end is given a speed 
towards the next one at time 
. All collision are completely elastic. Then
.png)
a)
The last block starts moving at time 
b)
The last block starts moving at time 
c)
The centre of mass of the system will have a final speed 
d)
The centre of mass of the system will have a final speed 
identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is . The block at one end is given a speed towards the next one at time . All collision are completely elastic. Thena)
The last block starts moving at time
b)
The last block starts moving at time
c)
The centre of mass of the system will have a final speed
d)
The centre of mass of the system will have a final speed
Question ID - 52512 | SaraNextGen Top Answer A set of identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is . The block at one end is given a speed towards the next one at time . All collision are completely elastic. Then
a)
The last block starts moving at time
b)
The last block starts moving at time
c)
The centre of mass of the system will have a final speed
d)
The centre of mass of the system will have a final speed
A set of identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is . The block at one end is given a speed towards the next one at time . All collision are completely elastic. Then
|
a) |
The last block starts moving at time |
b) |
The last block starts moving at time |
c) |
The centre of mass of the system will have a final speed |
d) |
The centre of mass of the system will have a final speed |
|
(d) Time taken by first block to reach second block Since collision is 100% elastic, now first block comes to rest and 2nd block starts moving towards the 3rd block with a velocity
Finally only the last
|
and takes time 
to reach 3rd block and so on
Total time 
time 
th block is in motion velocity 
, hence final velocity of centre of mass