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B) Two objects of masses 50g and 100g are moving along the same line and direction withvelocities of 5m/s and 10 m/s respectively. They collide and after the collision, the secondobject moves at a velocity of 8 m/s. Determine the velocity of the first object? |
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Answer» Answer: velocity of first OBJECT is 9m/s. Explanation: mass 1= 50g mass 2=100g INITIAL velocity 1=5m/s Initial velocity 2=10m/s Final velocity 1=? Final velocity 2=8m/s now TAKE momentum of the objects p=mv (initial momentum) 50*5+100*10=1250gm/s-------------1 p=mv (final momentum) 50*v+ 100*8=(50v+800)m/s------------2 Now combine 1 and 2----- 1250gm/s=50v+800m/s 1250-800=50v 450=50v 50v=450 v=450/50 v=9m/s. Therefore velocity of the first object is 9m/s. |
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