Question

An object starts from rest and accelerates uniformly in a straight line path in the positive x direction. After 12sec, it's speed is 72ms.find average velocity during first 12sec

Answer 1

average velocity = Total distance /total time

acceleration= v=u+at

72=0+a×12

a=6

total distance=1/2at^2

=1/2(6×12×12)

= 36×12

average velocity = 36×12/12

=36