Question

a body moving with a uniform retardation the equationv of motion v=?​

Answer 1

Explanation:

let us suppose that its initial velocity = u

using equation of motion

v2=u2+2as

(u/2)2 = u2 =2*a*3000 (value of final velocity is haif he initial taht is u/2 and s = 3 km =3000m)

 (u2/4) – u2 =2*a*3000

 (-3u2/4)=2*a*3000

 – u2=(2*a*3000*4)/3

 u2 = – 8000*a ….............................1

by appling the same equation when it comes to rest we get

02=(u/2)2 +2*a*s

 – u2/4 =2*a*s

 – u2/(4*2*a) = s

 – u2/8a = s

after substituting values form 1 we get

 – (-8000*a)/8a = s

 s = 1000m = 1km

Hope it helps.........