Final Exam Review Problems - Solutions

# Final Exam Review Problems - Solutions - PHYSICS 6 Review...

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1 PHYSICS 6 Review Problems SPRING 2005 I. Multiple choice -- circle the one best answer. 4a; 5c; 8c __________________________________________________________ 2. A ball is dropped off the roof of a building. It hits the ground in 2 seconds. a) How tall is the building? h = ½ g t 2 = 0.5 x 9.8 (m/s 2 ) x 4 s 2 = 19.6 m b) What is the vertical speed of the ball just before it hits the ground? v = g t = 9.8 (m/s 2 ) x 2 s = 19.6 m/s (this formula is true for constant acceleration = g) A second ball is thrown horizontally from the roof, with a horizontal velocity of 20 m/sec. c) How long does the ball take to reach the ground? 2 seconds (because the horizontal motion is independent of the vertical) d) How far from the building (the horizontal distance) does it land? v(horizontal) t = 20 (m/s) x 2 s = 40 m 3. An Israeli intermediate range missile is launched from a launching tube on the ground and travels to a target in Iraq 1000 Km away in 10 minutes . Assume the missile achieves its burnout velocity by the time it leaves its launching tube (i.e. thereafter there is no further rocket fuel).

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