Question

The angry bird shoots from the height of 36 feet with an initial velocity of 69 feet/second, when does it reach the ground?

A) After 2 seconds
B) After 3 seconds
C) After 4 seconds
D) After 5 seconds

Answer 1

The angry bird will reach the ground after 2 seconds (Option A).

Step-by-step explanation:

Using the laws of projectile motion, which are part of classical mechanics, the problem can be solved. The problem is analogous to one where an object is projected upward with a certain initial velocity and then falls to the ground due to gravity.

The time for projectile motion is completely determined by the vertical motion. So any projectile that has an initial vertical velocity of 69 feet/second and lands 36 feet below its starting altitude will spend 2 seconds in the air. Therefore, the angry bird will reach the ground after 2 seconds (Option A).