Question

A body starts rolling over a horizontal surface with an initial velocity of 0.5m/s. Due to friction, its velocity decreases at the rate of 0.05m/s2. How much time will it take for the body to stop?

Answer 1

hello friend
we can find the answer by using first law of motion 
= v = u + at 
given, u = 0.5m/s 
velocity decreases = 0.05m/s²
so ,
0= 0.5 + ( - 0.05 )t  [ (-) sign due to decrease in velocity ] 
= - 0.5 = - 0.05 
= -0.5 / 0.05 = t
= t= 10 sec
it will take 10 sec for a body to stop
hope it helps ..

Answer 2

Heya,

Given,

Initial velocity (u) =0.5 m/s

Final velocity (v) = 0 

Retardation = 0.05 m/s ²

V = u + at

0 = 0.5 + 0.05 t

Time taken = 0.5/0.05
= 10 sec

Time taken by the body to stop = 10 sec

hope it helps u..........