Answer :

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.