Your little dog, Fluffy, is excited to see you and jumps straight up in the air...

Your little dog, Fluffy, is excited to see you and jumps straight up in the air to a height of 0.680 m . What is Fluffy's initial speed as she leaves the ground? You can assume that Fluffy is in "Free Fall" (constant acceleration) during the jump.

v =

3.65

m/s

Correct

Part B

What is the length of time that Fluffy is in the air?

Expert Solution

Solution-

Height h = 0.680m
So the displacement of the Fluffy S = 0.68 m
Accleration a = -g
                     = -9.8 m / s ^ 2
Iinitial speed of the Fluffy u = ?
final speed i.e., speed at maximum height   is v = 0 m / s
from the relation v ^ 2 - u ^ 2 = 2aS
                                  - u ^ 2 = 2 ( -g ) S
                                           u= √[ 2 gS ]
                                            = 3.65 m / s
(b). time the flea in air = time of scent + time ofdecent
                                  = ( u / g ) + ( u / g )
                                  = 2u / g

=2*3.65/9.81

= 0.744 s

genius_generous answered 3 years ago

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