Question

Question
A ball falls vertically after being
dropped. The ball falls a distance d metres in a time of t seconds. d is directly proportional to the square of
t.
The ball falls 20 metres in a time of 2 seconds.
The time in seconds) that the ball takes to fall 605 m is

a) 10
b) 11
c) 12
d) 13​
Explain step by step

Answer 1

Answer:

c) 11

Step-by-step explanation:

As mentioned, 'd'is directly proportional to 't^2'.

Given d1=20 and t1=2

d2=605 and t2=?

(20/605)=(2*2)/(t2*t2)

(4/121)=4/(t2*t2)

(4/121*4)=1/(t2*t2)

(1/121)=1/(t2*t2)

121= t2*t2

t2=√121

t2=11.

Answer 2

Answer:

11

Step-by-step explanation:

because of proportional t2