Answer: 147m/s
Explanation:
You can use the first kinematic equation stating that:
[tex]V_f=V_i+at[/tex]
The object was dropped from the top of the building, therefore the initial velocity at t = 0 is zero. The acceleration of the object in free fall will always be due to the gravitational field, under the assumption air resistance is negligble. So, the equation reduces to:
[tex]V_f=(9.8m/s^2)(15s)=147m/s[/tex]
