Question

16. A particle is moving in a straight line under constant acceleration. If the motion
starts from rest, find the ratio of displacement in 3 second to that of 3rd second.


1)9÷5
2)5÷9
3)4÷9
4)8÷5​

Answer 1

Answer:

9/5

Explanation:

s= ut + 1/2 at² , as u=0 , then s = 1/2 a×3² = 9a/2,

as for s(t) = u + 1/2 a (2t -1) , then s = 1/2a(2×3-1) = 5a/2 , then s/ s(t) = 9/5 .