If you know the formula, the solution is easy.
Distance = (1/2) · (acceleration) · (time)²
= (1/2) · (9.8 m/s²) · (3.5 sec)²
= (1/2) · (9.8 m/s²) · (12.25 s²)
= 60.025 meters .
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If you don't know the formula, you can still answer the question
without too much trouble.
But I have to warn you: It will involve thinking.
Acceleration of gravity = 9.8 m/s² .
After falling for 3.5 seconds, the speed of the ball is (3.5 x 9.8) = 34.3 m/s .
The AVERAGE speed of the ball for the entire fall is
(1/2) (0 + 34.3) = 17.15 m/s .
Traveling for 3.5 seconds at an average speed of 17.15 m/s ,
the ball covers a distance of
(3.5 sec) x (17.15 m/s) = 60.025 m .