an object of mass 5 kg is thrown upward from ground at an angle of 37° from the horizontal with an initial speed of 100 m/ s.it suddenly explodes into three fragments 7 sec later .one fragment of mass 5 00 g moves downward with speed of 100 m/ s,the second one of 2500 g having speed of 200 m/ s moves west just after explosion.(a) what is the speed of third fragment just after explosion?(b) what is change of kinetic energy of object during the collision.

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