If an object is dropped, how fast will it be moving after falling #21 m#?
2 Answers
Jun 29, 2018
Explanation:
Use equation of motion
#"v"^2 - "u"^2 = "2aS"#
Where
#"v ="# Final velocity#"u ="# Initial velocity#"a ="# Acceleration#"S ="# Displacement
The object is dropped. So
Explanation:
- Using the formula:
where;
#v# is the final velocity of the object which we need to find.#u# is the initial velocity of the object, which is#0# since it fell from rest.#a# is the acceleration of free fall#("9.81 m s"^-2)# #s# is the displacement, which is#"21 m"#
Now all you gotta do is substitute:
So