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.
A formula for d can be given as d=5t^2
Calculate the distance the ball falls in 3 seconds.

2. 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.
A formula for d can be given as d=5t^2
Calculate the time the ball takes to fall 605m

thanks!