Coefficient of friction between two block shown in figure is `mu = 0.4`. The blocks are given velocities of `2 m//s` and `8 m//s` in the directions figure. Find

(a) The time when relative motion between them will stop
(b) the common velocities of blocks upto that instant. (c) Displacement of `1 kg` and `2 kg` block upto that instant `(g = 10 m//s^(2))`.

Options

A. `4 m` towards right `7 m` towards right
B. `4 m` towards left `7 m` towards right
C. `4 m` towards left `7 m` towards right
D. `4 m` towards right `7 m` towards right

Answer

A

Explanation

`a =mug, v=u +at, s =ut + (1)/(2)at^(2)` .