Answer:
Sorry @Josh2013, the answer is B. heart beating.
Explanation:
The reason for this answer is heart beating is an involuntary action, it happens on it's own. Eating, sleeping, and crying are all voluntary actions. And a behavior is an action you do voluntarily.
Answer:
E) d_{2} = 4d_{_{1}}
Explanation:
We know that the range of a projectile is given by:

where:
u = initial velocity of the projectile
angle of projection of projectile
<u>Now, range for ball 1 :</u>

<u>Now, range for ball 2 with double velocity and all the other parameters being the same:</u>


