Jumping refers to launching itself upwards. The squirrel reach a height of 4 feet once per jump.
Suppose that you've made a pole stand vertical on the ground. It is a measurement tool. Then, if some object goes through a particular level on that measuring pole's line' (parallel to ground), we say that it reached to that height.
Now, refer to the figure attached below.
Using the third equation of motion, we get:
(acceleration taken negative as it is downwards, and due to sign convention used, we take upward as +ve, downwards as -ve, left as -ve, right as +ve (sign of quantity if quantity(vector) is in these directions)).
[tex]v^2 = u^2 + 2as\\0 = 16^2 -2gh\\\\h \approx \dfrac{256}{2 \times 32} \approx 4\: \rm feet[/tex]
Thus, we see that the squirrel will reach at max 4 feet, and then falls to ground after reaching that. it doesn't cross 4 feet more than once per jump, but touches 4 feet height(theoretically, ideally) once only.
Thus, The squirrel reach a height of 4 feet once per jump.
Learn more about equation of motion here:
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