A ball is thrown horizontally from the top of a tall cliff.Three seconds later,the ball has fallen a vertical distance of
A)20 m.
B)30 m.
C)45 m.
D)depends on the initial horizontal speed of the ball

Question

Quizplus · Accepted Answer

The vertical distance that an object falls in freefall can be calculated using the formula:  d = 1/2 * g * t^2, where d is the vertical distance, g is the acceleration due to gravity (9.8 m/s^2), and t is the time in seconds. 
In this case, the ball falls for 3 seconds before hitting the ground. 
So, substituting the given values in the formula, we get, 
d = 1/2 * 9.8 * 3^2 = 44.1 ≈ 45m
Therefore, the best choice is C. The initial horizontal speed of the ball does not affect its vertical displacement due to gravity.

A Ball Is Thrown Horizontally from the Top of a Tall