Question

Handwritten Solution pic.....Plz.​

Answer 1

From the graph we can clearly see that

From the graph we can clearly see thatacceleration became constant(4.9m/s^2) at t=10s

at this acceleration,there might be slipping between the block A and B

so,in that case

u×N=m×a.....(u=coeeficient of Kinetic friction)

u×mg=m×a

u=a/g

u=4.9/10=.49=.5(approx)

so,option1) is the correct answer

so,option1) is the correct answer{hope it helps}