a student dropped a baseball from rest from the roof of a building. the ball took 4.0 seconds to reach the ground. how far did the ball fall
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If t = 4 seconds
a = gravity = 9.8 m/s^2
u, initial speed = 0
v, final velocity = ?
s, distance = ?
Using an equation of motion:
=> s = (u)(t) + [ (1/2) (a) (t^2) ]
=> s = (0)(4) + [ (1/2) (9.8) (4)^2]
Now, 'ut' falls out because u = 0
=> s = (1/2) (9.8) (16)
=> s = 78.4 meters
a = gravity = 9.8 m/s^2
u, initial speed = 0
v, final velocity = ?
s, distance = ?
Using an equation of motion:
=> s = (u)(t) + [ (1/2) (a) (t^2) ]
=> s = (0)(4) + [ (1/2) (9.8) (4)^2]
Now, 'ut' falls out because u = 0
=> s = (1/2) (9.8) (16)
=> s = 78.4 meters