KinematicsMedium
Question
One stone is projected horizontally from a 20 m high cliff with an initial speed of 10 ms-1. A second stone is simultaneously dropped from that cliff. Which of the following is true?
Options
A.Both strike the ground with the same speed.
B.The ball with initial speed 10 ms-1 reaches the ground first.
C.Both the balls hit the ground at the same time.
D.Both strike the ground with different speed
Solution
10 m/s = uA ; uB = 0 m/s uA = 10 
On reaching the ground,
Both will have same vertical velocity
Vy2 = uy2 + 2ay sy
since uy = 0 for both A & B
ay = g for both A & B
sy = 20 m for both A & B
Thats why the time taken by both are same
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