10. Convert 70 miles/hour to meters per hour. Convert 70 miles/hour to meters per second. 13. What is the result of (3.15 mx 1.53 m)/0.78 m with the proper number of significant figures? 18. A bird accelerates from rest (0 km/hr) to 5.00 km/hr in 2.3 seconds (time). 2 What is its acceleration in m/s? (Note: 1 hr=3600 s, 1000 m =1 km). 21. An airplane must accelerate from rest to about 50 m/s along the runway in order to be able to take off. During the takeoff, the airplane is able to accelerate 4 2 m/s. a) How much time does it take for the airplane to speed up to the take-off speed? b) How long does the runway need to be in order for the airplane to reach this speed? 26. You throw a golf ball off of the top of a building that is 14 m above the ground. The ball is initially thrown 12 m/s horizontally. a) How long does it take for the ball to hit the ground? b) How far away from the base of the building does the ball hit the ground? 3. What is the Scientific Method, and what are the steps to the Scientific Method? What is the difference between observing, inferring, and predicting?