Question
Tue September 10, 2013 By: Samrid Vinod

  • How long does it take to fall 4.9m.
  • A stone is dropped from the edge of a roof.

Expert Reply
Wed September 11, 2013
initial velocity, u  = 0
distance dropped be h
if h = 4.9 m
we know acceleration, g = 9.8 m/s.s
 
thus using second equation of motion, h = ut + 1/2gt2
we can find time required t.
 
for that t, we can use first equation of motion to find final velocity, v
v = u + gt
 
for last part, the acceleartion remains same, only velocity varies.
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