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Momentum 1
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How fast will two rail trucks travel after joining up?
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<div class="tib-quiz"><h4><img alt="" height="63" src="../../../physics/networks/img_0045.jpg" style="float: left;" width="189">A railway truck of mass 2000 kg travelling at 4 ms<sup>-1</sup> collides with a stationary truck of mass 3000 kg . The trucks join up and continue together. Find their common velocity.</h4><hr class="hidden-separator"><div class="exercise shadow-bottom"><div class="q-question"><h4>Which of the following assumptions do you have to make to be able to answer this question</h4></div><div class="q-answer"><h4><label class="checkbox"><input class="c" type="checkbox"> The track is flat.</label></h4><h4><label class="checkbox"><input class="c" type="checkbox"> Momentum is conserved</label></h4><h4><label class="checkbox"><input class="c" type="checkbox"> The track has no friction</label></h4><h4><label class="checkbox"><input type="checkbox"> Kinetic energy is conserved</label></h4></div><div class="q-explanation"><h4>The main thing is that the trucks must be considered isolated</h4></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><h4> </h4><div class="exercise shadow-bottom"><div class="q-question"><h4>Below is a diagram before and after the collsion</h4><h4 style="text-align: center;"><img alt="" height="178" src="../../../physics/networks/mom11.jpg" width="329"></h4><h4>Choose the correct labels<span><span><span></span></span></span></h4><h4><span class="q-text-draggable draggable" draggable="true">4 m/s</span> <span><span><span><span><span><span><span> </span></span></span></span></span> <span class="q-text-draggable draggable" draggable="true">v</span><span> </span></span></span> <span><span><span><span class="q-text-draggable draggable" draggable="true">10 ms<sup>-2</sup></span></span></span></span> <span class="q-text-draggable draggable" draggable="true">2000 kg</span><span> <span class="q-text-draggable draggable" draggable="true">3000 kg</span><span> <span><span><span><span> <span class="q-text-draggable draggable" draggable="true">4 ms<sup>-2</sup></span></span></span></span> <span> </span></span></span></span></h4></div><div class="q-answer"><h4> A<input type="text" style="height: auto;" data-c="4 m/s"> <span class="review"></span></h4><h4>B <input type="text" style="height: auto;" data-c="2000 kg"> <span class="review"></span></h4><h4>C <input type="text" style="height: auto;" data-c="3000 kg"> <span class="review"></span></h4><h4>D <input type="text" style="height: auto;" data-c="v"> <span class="review"></span></h4></div><div class="q-explanation"></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div></div>
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