Question

Body moves along a rough horizontal surface with velocity u=6 m/ s . If the body comes to rest after traveling 9m then the coefficient of sliding friction is..... A) 0.4 B)0.2. C)0.6

Answer 1

Explanation:

u=6m/s

to come in rest=9m

t=1.5 sec

Answer 2

Explanation:

v^2=u^2+2as

0^2=6^2+2a×9

so, a = -2m/s^2

force applied on the body = 2m N in -ve

direction

now since force is applied by friction

so,

2m = a × mg ( a = friction coefficient)

2m = a× 10m

so, a = 0.2