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While moving in a wagon (5 kg)along a sm...

While moving in a wagon `(5 kg)`along a smoth road at `0.5` m/s, a `15` kg boy throws a `3` kg bag of send in front of him with a speed `4` m/s relative to his original motion. How fast is he moving after he throws the bag of send. What is his final direction of motion ?

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The correct Answer is:
`"["0.1m//"backword"]"`
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