How long is the flea in the air Kinematic equations are used to determine the motion of an object. In this problem, you will apply kinematic equations to a jumping flea. Take the magnitude of free-fall acceleration to be 9.80 m/s^2. Flying fleas reach a height of 4.3 meters when they jump. How long is the flea in the air from the time it jumps to the time it hits the ground?
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Answer
Use s = u t + 1/2 a t^2
0.430 = 0 + 1/2 x 9.8 x t^2
0.860 / 9.8 = t^2
t = 0.29623 seconds
2 x 0.29623 = 0.59246 seconds
2
You are on the right track
consider
h=.5gt^2
h = 0.430 m
so t = sqrt(2h/g)
t(total)=2t
t(total)=2sqrt(2h/g)
t(total) 2 sqrt(2 x 0..430 /9.80)
t(total)=0.59 sec
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