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103.On a long horizontal belt, a child runs to and fro with a speed of 9 km/h (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 4 km/h. For an observer on the platform the speed of the child in the direction of motion of the belt is: 1. 9 km/h 2. 4 km/h 3. 13 km/h 4. 5 km/h

Answer» 103.On a long horizontal belt, a child runs to and fro with a speed of 9 km/h (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 4 km/h. For an observer on the platform the speed of the child in the direction of motion of the belt is: 1. 9 km/h 2. 4 km/h 3. 13 km/h 4. 5 km/h


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