Question

average velocity of a particle moving in a straight line, with constant acceleration of 2 m/s^2 and initial velocity of 5 m/s in first five seconds is....?

Answer 1

u= 5m/s 
v= ?
t= 5s 
a= 2m/s²

v=u + at 

v = 5 +2 x 5 

v= 15m/s

avg velocity = 15 +5 / 2 

avg velocity = 10 m/s 

Answer 2

u= 5m/s 
v= ?  ( not given)
t= 5s 
a= 2m/s²

v=u + at 

v = 5 +2 x 5 

v= 15m/s

avg velocity = v+u /t

avg velocity = 15 +5 / 2 

avg velocity = 10 m/s