Question

a body is moving on a rough horizontal surface co efficient of kinetic friction 0.2
find the retardation produced in the body (a)​

Answer 1

Due to friction, the body face a retardation of a=μg [μ : coefficient of friction]

also u=15m/s and v=0 (as it comes to rest)

From kinematics,

v=u+at which means:

⇒0=15−μgt⇒t=

mg

15

=

0.5×10

15

=35