Question

Marci drops a ball off the top of the Empire state building. How fast is the ball traveling after 4 seconds? (assuming there is no air)

Answer 1

Answer:We can use the kinematic equation:

v = vo + at

where:

v = final velocity (what we want to find)

vo = initial velocity (which is zero since the ball is dropped)

a = acceleration due to gravity (-9.8 m/s^2, negative since it is acting in the opposite direction of the ball's motion)

t = time (4 seconds)

Substituting the values, we get:

v = 0 + (-9.8 m/s^2)(4 s)

v = -39.2 m/s

Note that the negative sign indicates that the ball is moving downward.

Step-by-step explanation: