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On a long horizontally moving belt, a ch...

On a long horizontally moving belt, a child runs to and fro with a speed `9 km h^(-1)` with respect to the belt) between his father and mother located 50 m apart. The belt moves with speed of `4 km h^(-1)` . For an observer on a stationary platform, the speed of the child running in the direction of motion of the belt is

A

`4km h^(-1) - 1`

B

`5km h^(-1)`

C

`9km h^(-1)`

D

`13kmh^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
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AAKASH SERIES-RIVISION EXERCISE-MOTION IN A STRAIGHT LINE (HORIZONTAL MOTION)
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  6. A particle moving with uniform retardation covers distances 18 m. 14 m...

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  7. A body is moving along the +ve X-axis with uniform acceleration of -4m...

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  10. The position x of a particle varies with time t as x = at^2 - bt^3 . T...

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  11. The acceleration 'a' in m//s^2 of a particle is given by a=3t^2+2t+2 ...

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  15. The acceleration of a particle is increasing linearly with time t as b...

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  16. A car accelerates from rest at a constant rate alpha for some time, a...

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  17. On a two-lane road, car A is travelling with a speed of 36 km h^(-1) ...

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  18. Two towns A and B are connected by a regular bus service with a bus le...

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