P = Pb [Tb/(Tb + Lb (h -hb))] just search it up in the web
Displacement isn't total distance traveled, it's the distance from the original starting point. So the 70 meters South in addition to the 30 meters South would decrease the distance to the North. It would then, instead of being 100 meters North and 100 meters South, there would be zero displacement. Then you take 50-20 to get 30 meters West. Your final displacement is 30 meters.
Answer:

Explanation:
Given,
Distance travelled ( d ) = 176.4 meters
Time taken ( t ) = 4.5 seconds
<u>Finding </u><u>the </u><u>speed </u><u>of </u><u>a </u><u>cheetah</u>
Speed 


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<u>Let's </u><u>learn </u><u>about </u><u>Speed </u> :
Suppose a body moves 20 m in 2 seconds, either on a curved path or on a straight path. So , 10 m is the distance travelled by the body in each second which can be written as 10 m/s. This is called speed of the body. Thus, <u>Speed </u><u>is </u><u>defined </u><u>as </u><u>the </u><u>distance</u><u> </u><u>travelled</u><u> </u><u>per </u><u>unit </u><u>time.</u> It is the rate of distance travelled by a body.
Mathematically,

In SI system, the unit of distance is metre and time is second. Thus , the <u>SI </u><u>unit </u><u>is </u><u>speed </u><u>is </u><u>m/</u><u>s.</u>
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when the reflected rays of the mirror meets
Explanation:
When two incident rays go and strike to the mirror, their reflected rays meet and image is formed