Question

a body starts from rest in a straight line with an acceleration of 8.0 m/s² . draw the v-t graph and determine (i) velocity of the body after 5s? (ii) how much distance has the bidy moved in first 5s? (iii) what avg velocity is during this time?

Answer 1

i)here,a=8m/s
       time=5seconds
       u=0
     to find velocity- v=u+at
                               v=0+8*5
                               v=0+40
                                v=40m/s
ii)t=5seconds
  s=ut+1/2at*t
 s = 0*5+1/2*8*5*5
s=0+1/2*200
s=0+100
s=1000m
iii)average velocity=u+v/2
                                 =0+40/2
                                    =40/2
                                    =20m/s