In: Physics
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?
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