Question

A body starts from rest and moves with a uniform acceleration of 4m/s2 untill it travel a distance of 800 metre.Find the velocity

Answer 1

v^2-u^2=2as
v^2=2as(u=0)
=2×4×800
=6400
v=√6400
=80m/s

Answer 2

u=0 (body is at rest)
a = 4m/s^2
s= 800m
v^2 -u^2 = 2as (3 law of motion)
v^2- (0)^2 =2×4×800
v^2 -0 =6400
v^2= 6400
v= square root of (6400)
v= 80 m/ s