Answer:
20 m
Explanation:
The initial vertical velocity is 0. We can find the time (t) that it takes to fall 20 m (h) using the following expression.
h = 1/2 × g × t²
where,
g is the acceleration due to the gravity
t = √(2h/g) = √(2 × 20 m/ 9.8 m/s²) = 2.0 s
The rock is in the air during 2.0 s and moves horizontally at a constant speed of 10 m/s. The horizontal distance traveled is:
d = v × t = 10 m/s × 2.0 s = 20 m
