Two balls are simultaneously dropped from a height of 5.0 m. How long tg does it take for the balls to reach the ground? Use 10 m/s2 for the magnitude of the acceleration due to gravity.

Question

Two balls are simultaneously dropped from a height of 5.0 m.  How long tg does it take for the balls to reach the ground? Use 10 m/s2 for the magnitude of the acceleration due to gravity.

anonymous · Answer

i know to use the kinematic equation, but I'm lost with what to plug in where?

rajat97 · Answer

okay @cbentley you have to use the kin. equation
s=ut+(at^2)/2
here s=displacement=-5  (-ve sign as it is in the negative direction i.e. downward direction)
next u=initial velocity=0 in this case as both the balls are dropped.
next
the acceleration
its acceleration due to gravity in this case=-10 again it is in the downward direction so it is -ve
next
t=time=unknown
now substitute the values accordingly in the equation and then find the time
and both the balls will reach the ground at the same time