There are a lot of reasons why gum is bad for you but a main reason because if you make a bubble and swallow it you could choke. Another reason is because it breaks down your gums.
Answer:

Explanation:
Given:
the displacement as the function of time:

here time is in seconds and the displacement in meters.
Now we differentiate this eq. of displacement to get the equation of velocity:

According to given the velocity is
at some time:


& is the only time for (t>=0) instances when the particle will have a velocity of
but in the opposite direction.
Answer:
C
Explanation:
Because...
A= Incideant ray
B= Angle of inciderance
<u>C= angle of reflection</u>
D= reflection ray