Find the equivalent resistance across `AB` :

Answer

`(##ALN_PHY_C05_E01_136_A01##)`

Explanation

For `0 le t lt 1` from `v_(cm) = (m_(1)v_(1) + m_(2)v_(2))/(m_(1) + m_(2))`
`rArr 2 = ((1) (1) + (2)v_(2))/(3)`
`rArr v_(2) = 2.5 ms^(-1)`
`rArr x_(2) = 2.5t`
for `1 le t lt 2,2 = ((1) (-1) + 2(v_(2)))/(3)`
`rArr v_(2) = 3.5ms^(-1)`
`rArr x_(2) = 2.5 + 3.5 (t - 1)`