hcverma

See if the ball hits the the nth then y = n-1 since the ball is already a 1m high
x = 110 + y

x = 35* 3/5 * t
x = 21t

y = 35*4/5*t - 4.9t²
y = 28t - 4.9t²
21t = 28t - 4.9t² +110
4.9t² - 7 t - 110 = 0
t =5.5
y = 154 - 148.225
y = 5.775
n -1 = 5.8
n = 6.8
therefore the sixth bench

yup that's prob i m facing .6.8 i.e.it will 7th step(think carefully).but ans. is 7th

the answer is sixth

See it has to be rounded to the lower integer since the height is inadequate for the 7th step but perfectly adequate for the 6th

tell me y??????n=6.8
then ans. is 7 clearly.

See if y = 6.8
At that time
x = 21*5.5
x = 115.5
Rite?

Noe first bench is at 110m
Therefore 5.5m into the stadium
Each bench is 1m wide
Therefore 5.5th bench therefore it is the 6th bench

one more think
Step 1 is between 110 and 111
Step 2 is between 111 and 112
Step 3 is between 112 and 113
Step 4 is between 113 and 114
Step 5 is between 114 and 115
Step 6 is between 115 and 116

here is the right one

See if the ball hits the the nth then y = n-1 since the ball is already a 1m high
x = 110 + n=110+y+1 i.e. y=x-111

x = 35* 3/5 * t
x = 21t

y = 35*4/5*t - 4.9t2
y = 28t - 4.9t2
21t = 28t - 4.9t2 +111
4.9t2 - 7 t - 111 = 0
t =5.5

x=21*5.5=115.5

n=115.5-110=5.5

therefore the sixth bench