Question

A ball is dropped off the side of a bridge after falling 1.55 s, what is its velocity.

Answer 1

-15.2

Step-by-step explanation:

the guy above didn't put a negative when talking about gravity which is always -9.80

Answer 2

v = 15.19 m/s

Step-by-step explanation:

As we know that when object is dropped from some height then initial speed of the object is taken as

`v_i = 0`

now for the final speed of object we can say that if acceleration is constant then the final speed will be given by kinematics equation

`v_f = v_i + at`

here we have

`a = 9.8 m/s^2` (due to gravity)

now from this equation of motion

`v_f = 0 + (9.8)(1.55)`

`v_f = 15.19 m/s`