An open tank `10 m` long and `2 m` deep is filled up to `1.5 m` height of oil of specific gravity `0.82`. The tank is uniformly accelerated along its length from rest to a speed of `20 m//s` horizontally. The shortest time in which the speed may be attained without spilling any oil is

Options

A. `20s`
B. `18s`
C. `10s`
D. `5s`

Answer

A

Explanation

`v=u+a_(x)t, =v/t`
`tantheta=(a_(x))/g=v/(tg)=0.5/5`(in triangle ABC)
`impliesg=(10xx20)/10=0s`