The mother of a 7 and ½ year-old boy describes a 6-month history of excessive eye blinking and intermittent chirping. this

b. Provisional tic disorder

Explanation:

Provisional tic disorder -

It is a type of motor disorder , where there is abnormality and repetition in the vocal cord and there is not proper rhythm.

This disorder is usually seen in children , just before reaching the stage of puberty in the age group of 4 to 6 and is very extreme in the age group 10 to 12.

This disorder is more likely to occur in boys than in girls.

Hence , from the given scenario of the question,

The correct option is b. Provisional tic disorder .

we can solve this via the kinematic equation:

[tex]h=v_{y}t+\frac{1}{2}gt^2[/tex]

where the vertical velocity is zero and so:

[tex]h=0 \times t +\frac{1}{2}gt^2\\\\h=\frac{1}{2}gt^2\\\\t=\sqrt{\frac{2h}{g}}[/tex]

since the height of the building is 29.3 meters then:

[tex]t= \sqrt{\frac{2(29.3)}{9.8}}\\\\t \approx 2.45s[/tex]

the ball was in motion for approximately 2.45 seconds

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