Question.3712 - Homework Assignment for Exam 1 PHYS 100 Chapter 2 Problems due 9/16/24 (redo) E1. Average?Speed = 7 hours / 413 miles? = 59 miles?per?hour. E8. In terms of speed in km/s = 1m to 0.001 km = so 28 m/s x 0.001 = 0.028 km /s. In terms of speed in km/h = 1m/s = 3.6 km/h = 28 x 3.6 = 100.8 km/h. E10. Change in velocity = ?v = 31 m/s? Change in time = ?t = 4 sec Acceleration = ?v / ?t = 31/4 = 7.75 m/s2. E11. Change in velocity = ?v = 20 28 = -8 m/s A = ?v / ?t = - 8 /4 = E12. V = u + at = 0 + (6.7 x 4) = 26.8 m/s. E14.a) v = u + at = 16 + (2.8 x 3) = 24.4 m/s. b) d = ut + ? at2 = 16 x 3 + 0.5 x 2.8 x 32 = 60.6 meters. E16. v = u + a x t = 32 + (-4 x 5) = 12 m/s d = ut + ? at2 = 32 x 5 + ? x (-4) x 52 = 110 meters. E18. t = d/s = 100/9 = 11.11 seconds. E20. v = u + a x t (at each speed) v(1s) = 0 + (7.75 ? 1) = 7.75 m/s v(2s) = 15.5 m/s v(3s) = 23.25 m/s v(4s) = 31 m/s d = ut + ? at2 d(1s) = 0 + ? x 7.75 x 12 = 3.875 meters. d(2s) = 15.5 meters. d(3s) = 34.875 meters. d(4s) = 62 meters.
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