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A particle moves in a straight line with...

A particle moves in a straight line with a constant acceleration. It changes its velocity from `10 ms^-1` to `20 ms^-1` while passing through a distance `135 m` in `t` seconds. The value of `t` is.

A

`12`

B

`9`

C

`10`

D

`1.8`

Text Solution

Verified by Experts

The correct Answer is:
B
(2) `(20)^(2)=(10)^(2)-2axx135`
`a=300/270=10/9 m//s^(2)`
`20=10+a t=10+10/9 t`
`t=9 s`
OR
`s=((u+v)/2)t`
`135=((10+20)/2)timpliest=9s`
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