Question

i) If the acceleration during the first part of the journey is 'n' and deceleration for
the second part is 2a, the ratio of the heights covered in the first part, is that
in the second part of the journey, is :
(a) 1:1
(b) 1:2
(d) 2:1
(c) 1:3​

Answer 1

Explanation:

Initial speed u=0

Distance covered in nth second after starting from rest S=

2

1

(2n−1)

For A : n=5

So, S

A

=

2

a

1

(2×5−1)=

2

9

a

1

For B : n=3

So, S

B

=

2

a

2

(2×3−1)=

2

5

a

2

But S

A

=S

B

Or

2

9

a

1

=

2

5

a

2

⟹ a

1

:a

2

=5:9