Question

a body starts to slide over a horizontal surface with a initial velocity of 12 m/s.due to friction it's velocity decreases at the rate of 2 m/s².how much time will it take for the body to stop?

Answer 1

initial vel=12 m/s
final vel = 0
acc= -2 m/s²
t = ?

v = u + at
0 = 12 + (-2) * t
2t = 12
t = 12/2
t = 6 seconds

Answer 2

u=12m/s

v=0m/s                                    a=v-u/t

a=-2m/s                      t=v-u/a

t=?

t=-12/-2

  t=6s