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ENRICHED WORK POWER ENERGY TEST A (3)

# ENRICHED WORK POWER ENERGY TEST A (3) - NAME SPH3U3/6 WORK...

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NAME________________________________ SPH3U3/6 WORK, POWER & ENERGY TEST A MULTIPLE CHOICE : Place your answer on the LEGAL SIZE paper. 1) ( 1K ) An object with mass m and speed v 0 directed to the right strikes a wall and rebounds with speed v 0 directed to the left. The change in the object’s kinetic energy is A) - m v 0 2 B) - 1 2 0 2 m v C) 1 2 0 2 m v D) m v 0 2 E) 0 2) ( 1K ) Each of the four identical carts shown below is loaded with a total mass of four kilograms. All of the carts are initially at rest on the same level surface. Forces of the same magnitude directed to the right act on each of the carts for the same length of time. If friction and air resistance are negligible, which cart will have the greatest velocity when the applied force stops? A) All four carts will have the same velocity. B) Cart 1 C) Cart 2 D) Cart 3 E) Cart 4 3) ( 1K ) Alice and Bill are standing at the top of a cliff of height H . Both throw a ball with initial speed v 0 . Alice throws her ball straight down while Bill throws his ball straight up. The speeds of the balls when they hit the ground are v A and v B respectively and the times that the balls hit the grounds are t A and t B respectively. Which of the following mathematical statements is CORRECT ? A) v v A B < B) v v A B = C) v v A B D) t t A B = E) t t A B

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