Question

29. A particle moves with constant acceleration along a straight line starting from rest. The
on along a straight line starting from rest. The percentage increase
in its displacement during the 4th second compared to that in 3rd second is
(1) 33%
(2) 40%
(3) 60%
(4) 77%​

Answer 1

✨HERE IS YOUR ANSWER

LET CONSTANT ACCELERATION = a

by :- s = ut+1/2at²

s = 1/2at²

at 3rd sec .........

s = 9a/2

at 4th sec.....

s = 8a

difference in S :-

8a-9a/2 = 7a/2

percentage :-

x/100×9a/2 = 7a/2

x = 77% ans.

hope it helps you ☺