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?

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? (A) Both strike the ground with the same velocity (B) The ball with initial speed 10 ms -1 reaches the ground first (C) Both the balls reach ground at the same time (D) One cannot say without knowing the height of the building

Tardigrade Admin · Accepted Answer

For vertical motion, the initial speed for both the stones is same, g is same, hence the time when they reach the ground will be same. t=√(2 h/g)

Q. One stone is projected horizontally from a $20 m$ high cliff with an initial speed of $10 m s^{- 1}$ . A second stone is simultaneously dropped from that cliff. Which of the following is true?

Both strike the ground with the same velocity

The ball with initial speed $10 m s^{- 1}$ reaches the ground first

Both the balls reach ground at the same time

One cannot say without knowing the height of the building

For vertical motion, the initial speed for both the stones is same, $g$ is same, hence the time when they reach
the ground will be same. $t = \frac{2 h}{g}$

Q. One stone is projected horizontally from a 20m high cliff with an initial speed of 10ms−1. A second stone is simultaneously dropped from that cliff. Which of the following is true?