1.

The velocity of a particle at an instant is `10 m s^(-1)`. After 3 s its velocity will becomes `16 m s^(-1)`. The velocity at 2 s, before the given instant will beA. `6 m s^(-1)`B. `4 m s^(-1)`C. `2 m s^(-1)`D. `1 m s^(-1)`

Answer» Correct Answer - A
Here, u = `10 m s^(-1), t = 3 s, v = 16 m s^(-1)`
`a = v - u/t = 16 - 10/3 = 2 m s^(-2)`.
Now velocity at 2 s, before the given instant
`10 = u + 2 xx 2` `therefore` u = 6 m `s^(-1)` (since v = u + at)


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