When Alana moving 19km/h, a stationary object will be perceived by her as moving toward her with 19km/h velocity. If the object is not stationary(velocity isn't zero), the speed will increase by the object velocity.
the relative speed of the tennis ball=
the speed of Alana + true speed of the tennis ball
19km/h+ 11km/h= 30km/h
My guess for this one would be; 400 N
My reasoning would be; it starts at 0 on both X and Y, if you need to get to 1.00 meters thats 4/4. 1/4 of 1.00 is .25, and on .25 its on 100 so multiply it by 4 to make 1.00 and you get 400 N
Answer: C. luster
Explanation:
2 minerals could have the exact same length, size or weight, and be completely different minerals, so luster would be the most helpful.
Hope this helped!
<span> B. Hypothalamus responds to prostaglandin which increases the bodies temperature.
Hoped it helped!! </span>
The pressure is 
.
Answer: Option A
<u>Explanation:</u>
Pressure defines the force acting per single area. So depending upon the amount of force acting over a given area in the perpendicular direction of the object, the pressure acting on that area will vary.
So the pressure is directly proportionate to the applied force on a particular region and inversely proportionate into the areas of the region. Hence, the unit of pressure is considered as 
or Pascal. Pressure can also be termed as the number of air molecules present in a specified closed region. Thus, for the present condition
Thus, by appling the given values in the above equation, we get,
=
So the pressure is .
