1.

A body initially at rest is moving with uniform acceleration 'a'. It's velocity after n seconds is v. The displacement of the body in last 2 seconds is:

Answer»

`(2v(N-1))/(n)`
`(v(n-1))/(n)`
`(v(n+1))/(n)`
`(2v(n+1))/(n)`

Solution :Here the displacement in LAST 2S `(1)/(2)an^(2)-(a)/(2)(n-2)^(2)`
`s=(a)/(2)[n^(2)-n^(2)-4+4n]`
=2a[n-1]
Also `a=("VELOCITY")/("time")=(v)/(n)`
`:. S=(2v(n-1))/(n)`


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