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Grade: 9
`        A body moving with uniform retardation covers covers 3km before it's speed is reduced half of value. What is another distance travelled before comes rest`
one year ago

## Answers : (1)

Arun
22967 Points
```							 let us suppose that its initial velocity = uusing equation of motionv2=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)$\therefore$ (u2/4) – u2 =2*a*3000$\therefore$ (-3u2/4)=2*a*3000$\therefore$ – u2=(2*a*3000*4)/3$\therefore$ u2 = – 8000*a                      ….............................1by appling the same equation when it comes to rest we get     02=(u/2)2 +2*a*s$\therefore$ – u2/4 =2*a*s$\therefore$ – u2/(4*2*a) = s$\therefore$ – u2/8a = safter substituting values form 1 we get$\therefore$ – (-8000*a)/8a = s$\therefore$ s = 1000m = 1km
```
one year ago
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