"A block moves at 5.0m/s in the positive xdirection and hits an identical block, initially at rest. A small amount of gunpowder had been placed on one of the blocks. The explosion does not harm the blocks but it doubles their total kinetic energy. After the explosion the blocks move along thexaxis and the incident block has a speed in of:"
" A. 1.8m/s B. 5.0m/s C. 6.8m/s D. 7.1m/s E. 11.8m/s"
"Two identical carts travel at 1m/s in opposite directions on a common horizontal surface. They collide head-on and are reported to rebound, each with a speed of 2m/s. Then:"
" A. momentum was not conserved; therefore, the report must be false B. if some other form of energy were changed to kinetic during the collision, t...
"Two objects, X and Y, are held at rest on a horizontal frictionless surface and a spring is compressed between them. The mass of X is 2/5 times the mass of Y. Immediately after the spring is released, X has a kinetic energy of 50J and Y has a kinetic energy of:"
" A. 20J B. 8J C. 310J D. 125J E. 50J"
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