A body is sliding with a velocity of 8 m/s comes at rest after travelling 40m Find coefficient of friction

u = 5.6 m/sec, v = 0, s=8m, g=9.8m/sec2

v2 - u2 = 2as

a= -5.6 * 5.6/16

a = -1.96 m/sec2

now,

coeff. of friction = a/g

= 1.96/9.8

= 0.2