A jet airplane travelling at the speed of $$500~\text{km/h}$$ ejects its products of combustion at the speed of $$1500~\text{km/h}$$ relative to the jet plane. What is the speed of the latter with respect to an observer on the ground?
1. $$1000~\text{km/h}$$
2. $$500~\text{km/h}$$
3. $$1500~\text{km/h}$$
4. $$2000~\text{km/h}$$


Subtopic:  Relative Motion in One Dimension |
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A police van moving on a highway with a speed of  fires a bullet at a thief’s car speeding away in the same direction with a speed of . If the muzzle speed of the bullet is  with what speed does the bullet hit the thief’s car?

Subtopic:  Relative Motion in One Dimension |
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On a long horizontally moving belt (as shown in the figure) a child runs to and fro with a speed  (with respect to the belt) between his father and mother located 50 m apart on the moving belt. The belt moves with a speed of . For an observer on a stationary platform outside, what is the speed of the child running in the direction of motion of the belt?

1. 5 kmh-1
2. $$\sqrt{41}$$ kmh-1
3. 21 kmh-1
4. 13 kmh-1

Subtopic:  Relative Motion in One Dimension |
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