Answer:
3. 3.5 s
Explanation:
The position of traveller A is given by the equation:
where
is the acceleration of A
t is the time measured from when A started the motion
The position of traveller B instead is given by
where a (acceleration) is the same as traveller A, and
is B's initial velocity. We can verify that the formula is correct by substituting t=2, and we get 
, which means that B starts its motion 2 seconds later.
Traveller B overtakes traveller A when the two positions are the same, so:
Answer: The variable that you manipulate is called the independent variable. The variable that you measure is called the dependent variable.
Answer:
(A) Their high energy
Explanation:
The higher the energy of the x-ray the more "likely" they will pass through.
The x-ray is electromagnetic energy caused by energy changes in an electron.
X-ray are energetic and have enough energy to break up molecules. That is what reveals the bad or damaged cells in our body.
Answer:
a) 15 b) 60 i think is the answer
