Physics

Problem

A block

A

is placed over a long rough plank

B

of same mass as shown in figure. The plank is placed over a smooth horizontal surface. At time

t=0

, block

A

is given a velocity

v_0

in horizontal direction. Let

v_1

and

v_2

be the velocities of

A

and

B

at time

t

. Then choose the correct graph between

v_1

v_2

and

t