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Question Number 21112 by Tinkutara last updated on 13/Sep/17
Aballisbouncingelasticallywithaspeed1m/sbetweenwallsofarailwaycompartmentofsize10minadirectionperpendiculartowalls.Thetrainismovingataconstantvelocityof10m/sparalleltothedirectionofmotionoftheball.Asseenfromtheground(a)thedirectionofmotionoftheballchangesevery10seconds.(b)speedofballchangesevery10seconds.(c)averagespeedofballoverany20secondintervalisfixed.(d)theaccelerationofballisthesameasfromthetrain.
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