Answer:
3.5 s
Explanation:
The brick is in free-fall, so it undergoes constant acceleration. The motion can be modeled using kinematic equations, also known as SUVAT equations. The equation we will use is:
s = ut + ½ at²
where
- s is the displacement
- u is the initial velocity
- a is the acceleration
- t is the time
The initial velocity is u = 0 m/s. Taking down to be positive, the displacement is s = 60 m and the acceleration is a = 9.8 m/s². Solving for time:
s = ut + ½ at²
60 m = (0 m/s) t + ½ (9.8 m/s²) t²
t = 3.5 s
It takes 3.5 seconds for the brick to hit the ground.
