Explanation

Temporary  عارضی

Everlasting لازوال

Explanation

I dropped ⇒ initial velocity =0

⇒ time will be given by h=12gt^2

t=√2hg=√2×20 m10 m/s^2=2 sec

II both reaches simultaneously be so ti,e taken by IInd stone will be 

2 sec−1 sec=1 sec

or t′=1 sec

putting it in h=ut'+12gt^2

& h=20 m,g=10m/s^2

we get 

20=u×1+5×1

⇒u=15 m/s

Explanation

alloy, a metallic substance composed of two or more elements as either a compound or a solution

A metal is  a chemical element

so answe "B " is correct

Explanation

Optional  اختیاری

Compulsory لازمی

Explanation

Given, 'Fruit is sweet' ≡ '479'...(i)

'Very sweet voice' ≡ '248'...(ii)

and 'Eat fruit daily' ≡ '637'...(iii)

From equations (i) and (ii) sweet' is coded as '4'.

From equations (i) and (iii), fruit' is coded as '7'.

From equation (i), 'is' is coded as '9'.

Explanation

Area control center/en-route center.

ATC provides services to aircraft in flight between airports as well.

Explanation

 Runway End Safety Area (RESA) is An area symmetrical about the extended runway center line

and adjacent to the end of the strip primarily intended to reduce the risk of damage

to an airplane undershooting or overrunning the runway.

Explanation

Arm (moment arm) is the horizontal distance in inches from the reference datum line to the CG of an item.

The algebraic sign is plus (+) if measured aft of the datum

and minus (–) if measured forward of the datum.