A jet airplane travelling at the speed of  ejects its products of combustion at the speed of  relative to the jet plane. What is the speed of the latter with respect to an observer on the ground?

Subtopic:  Relative Motion in One Dimension |
55%
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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 |
58%
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