<p>Marvelous Motion – Homework – Physics</p><p>Show your work, with units and significant digits. Use 9.81 m/s/s for gravity.</p><p>1) Dr. Presley just bought a new van for CRHS to use for All State trips. When he takes it out for a test drive, he finds that he can accelerate from rest to 26.8 m/s over a distance of 101.8m. What is the acceleration of this van?</p><p>2) How long did it take for Dr. Presley to get the van from 60 mph (26.8 m/s)?</p><p>3) The pole vault record is 6.15m. How long will an athlete who can make that height be in free fall, assuming the mat is 1.05m high?</p><p>4) How fast is the vaulter in #3 going when she hits the mat?</p><p>5) A hiker accidentally knocks a rock lose as he makes his way along a canyon. It strikes the ground below at 22.5 m/s. How high was the cliff, assuming no air resistance?</p><p>6) In the first Sherlock Holmes movie (the new one is out in a few months), Robert Downey Jr. jumps out a window and into the Thames. The time for his free fall was 1.69s. From what height did our hero jump?</p><p>7) In a parade, a horse and rider make their way down the street at a stately .921 m/s for 5.00 minutes. How far do they travel in meters?</p><p>Answers: 1) 3.53 m/s/s 2) 7.59s 3) 1.02s 4) 10.0 m/s 5) 25.8 m 6) 14.0 m 7) 276 m</p>