Kinematics Question 169

Question: A body starts from rest with uniform acceleration. If it’s velocity after n second is v, then it’s displacement in the last two seconds is

Options:

A) 2v(n+1)n

B) v(n+1)n

C) v(n1)n

D) 2v(n1)n

Show Answer

Answer:

Correct Answer: D

Solution:

[d]

v=0+naa=v/n

Now, distance travelled I n sec αSn=12an2 and distance travelled in (n2)

secSn2=12a(n2)2

distance travelled in last two seconds, =SnSn2=12an212a(n2)2

=a2[n2(n2)2]=a2[n+(n2)][n(n2)]

=a(2n2)=vn(2n2)=2v(n1)n



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