A body starts to slide over a horizontal surface with an initial velocity of 0.5 m/s. Due to friction, its velocity decreases at the rate 0.105 m/s2. How much time will it take for the body to stop?
Using the first equation of motion: v = u + at
where: v = final velocity = 0 m/s
u = initial velocity = 0.5 m/s
a = acceleration = -0.105 m/s2
t = time = ??
v = u + at
0 = 0.5 - 0.105 x t
0.105 x t = 0.5
t = 
s =4.76 s
15