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
Answer: Option B
:
B
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:
B
Given distance s is directly proportional to square of time t.
That is:
s=k.t220=4kk=5So,s=5t2605=5t2
t = 11 seconds
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