The body has a speed of 5 m / s relative to the car to the right, and the car has a speed of 10 m / s relative

| February 9, 2021 | education

The body has a speed of 5 m / s relative to the car to the right, and the car has a speed of 10 m / s relative to the ground to the left. what is the speed of the body relative to the ground?

Vtv = 5 m / s.

Vvz = 10 m / s.

Vtz -?

The speed of the body relative to the stationary frame of reference Vtz, which is the earth, is found by the vector sum of the speed of the body relative to the moving frame of reference Vtz and the speed of the moving frame of reference relative to the stationary Vvz: Vtz = Vtv + Vvz.

Since the velocities Vtz and Vvz are directed in opposite directions, the speed of the body relative to the earth will be the difference between the velocities Vtz = Vtv – Vvz.

Vtz = 5 m / s – 10 m / s = – 5 m / s.

The “-” sign indicates that the body will move at a speed of Vtz = 5 m / s in the direction of the movement of the car relative to the ground, that is, to the right.

Answer: relative to the ground, the body will move to the right with a speed of Vtz = 5 m / s.



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