Question

 .A body starts from rest and moves with a uniform acceleration of 4m/s2 until it travels a distance of 800m, Find the final velocity?​

Answer 1

Answer:

Explanation:

a=4 m/s2   ,  s=800m    ,  u=0 m/s

we know that

s=ut+ 1/2 at2

so;

800=0+1/2*4*t2

800= 2 t2

400=t2

t=20 s

we also know that;

a=(v-u)/t

4=v-0/20

80=v

v=80 m/s

Answer 2

Answer:

initial velocity(u)=0m/a

acceleration (a)=4m/s2

distance (s)=800m

final velocity(v)=?

Explanation:

by formula

v^2=u^2+2as

v^2=(0)^2+2×4×800

v^2 =0+6400

v^2 =6400

v=_/6400

v=80m/s