While in an airplane flying at 100 km/h you look down from the window and spot another airplane flying at the same speed in the opposite direction.Relative to you,the speed of the spotted plane is
A)zero.
B)100 km/h.
C)150 km/h.
D)200 km/h.

Question

Quizplus · Accepted Answer

When you are looking down from the window of the airplane, your frame of reference is the airplane you are in. Therefore, the speed of the spotted plane relative to you can be calculated by adding its speed to the speed of your airplane since both are moving in opposite directions.

Relative speed = speed of plane 1 + speed of plane 2

Relative speed = 100 km/h + 100 km/h

Relative speed = 200 km/h

Therefore, the correct answer is D) 200 km/h.

While in an Airplane Flying at 100 Km/h You Look