Question

with an initial speed vo. The projectile rises i and falls straight back down to the ground at zero height. What is total work done by the agent that fired the projectile during this trajectory? A) +mghmax B) +mgho D) -mg(2hmax - ho) C) zero E-mgho 14. Consider the following collision: Box 1 of mass m, moving to the right V/2, collides with Box 2 of mass 2m, initially at rest. Immediately after the collision, Box 1 is moving left with speed v/2 and Box 2 is moving right with speed v/2. What can you say about the total momentum and total kinetic energy (KE) during this collision? 2m AFTER rest BEFORE A) Both total momentum and total KE are conserved. B) Neither total momentum, nor total KE are conserved. C) Total momentum is conserved, but total KE decreased. D) Total momentum is conserved, but total KE increased. E) Total KE is conserved, but total momentum was not. 15. A Freighter displaces 600 metric tons of fresh water. The water line on the ship is adjusted correctly in fresh water. The ship enters sea water (p = 1025 kg.m) via a serie of locks. How many cubic meters of sea water must enter the bilge tanks to correctly position the waterline at sea? A) 48,780 m B) 48.78 m C) 4.976 m D) 14.63 m A) None of these 16. Two boxes with masses 3m and m are on the ends of a board of negligible mar which pivots on a frictionless fulcrum at its center. The board has total length 2L; held horizontally and then released from rest. What is the magnitude of the initial a acceleration a, immediately after the board is released? B) SB c) 128 D 31 )

Answer 1

Page No. Ans-y Date V/2 2m m 2 m 4EO(2et) VI2 before collision a perodi'sion So before collision momentum is MAV 2Mxo after colu'si0n momentum is Mx-V + befooe collision - after collis'Sn momentum is Conserved Now fr Enery (KE hefare calli'sion Enery is 2 KEI=MV 2

Page No. 2 Date lbetort Collsion &nery fs mv QPer Collisis Enerey (m)X 2 4 myt2mv 3m V cincased kinetic Energy betore colusion kinete Energy Aer colutim Sa, We can Say that in this cousion Only momentum is conserved, hinete Enery is nat onserved (D2 Option co is Comect OPtion C is comcat Total momuntum is camsermd but k.E has increand
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