7. A car can accelerate at 4 m./sec.2. How long will it take to reach 90 km./h. from rest? (ans.: 6.25)

PROBLEM 2.5 A car moving at 80 km/h comes to a stop in 6.0 s. What was its average deceleration? 5. c. 1.45 m/s2 d. 3.70 m/s² а. 2.40 m/s² b. 4.21 m/s²

PROBLEM 2.7 7. A train running at 80 kph decelerates at 3 m/min? for 18 minutes. Find the distance travelled within this period. а. 16.14 km c. 18.14 km 17 LECTURE NOTES IN ENGINEERING MECHANICS b. 17.14 km d. 19.14 km

PROBLEM 2.27 A girl is riding her bicycle. When she gets to a corner, she stops to get a drink from her water bottle. At that time, a friend passes by her, traveling at a constant speed of 10.0 m/s. 32. After 25 s, the girl gets back on her bike and travels with a constant acceleration of 2.5 m/s². How long does it take for her to catch up with her friend? c. 20.70 s d. 21.70 s а. 19.70 s b. 18.70 s 33. If the girl had been on her bike and rolling along at a speed of 1.5 m/s when her friend passed, what constant acceleration would she need to catch up with her friend in the same amount of time? c. 0.709 m/s² d. 0.609 m/s² а. 0.809 m/s² b. 0.909 m/s2