UPSEE Solved Model Paper 3

According to questions
(

29

30

v)2−v2 = 2ax
(i) Let the number of wooden plank is n and hence the thickness of ot will be nx, then, 0 - v2 = 2anx
⇒ n = −

v2

2ax

n = −

v2

( 29 30 )v2−v2

=

−(30)2

(29)2−(30)2

[from (i)]
=

30×30

59

= 15.25
So, least number of planks = 16