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# sol2 - miles hour ൌ 58miles ൈ 1km 0.6214miles ൈ 1...

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1. question 21 page 35 a. Velocity is vector quantity. If we set the forward movement to the positive vector, the car moves forward because velocity is everywhere positive on the graph. b. ans: A , The change of velocity is greatest, or slope is deepest. 2. question E1 page 36 Speed ൌ Distance time 460miles 8hours ൌ 57.5miles/hours The units of speed can be converted from one unit to another, for example, miles/hour, meter/sec, or km/hours. So, you have to write the unit when you solve the this kind of problem. 3. question E6 page 36 Time ൌ Distance Speed 300miles 62MPHሺmiles per hoursሻ ൌ 4.84hours 4. question E7 page 36 1.2m s ൌ 1.2m ൈ 1km 1000m 60s 1min 60min 1hour ൌ 4.32km/hour (3600s = 1hour) 5. question E9 page 36 58MPH ൌ 58

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Unformatted text preview: miles hour ൌ 58miles ൈ 1km 0.6214miles ൈ 1 hour ൌ 93.34km/hour 6. question E10 page 36 Average acceleration ൌ Velocity time ൌ 7m/s 2s ൌ 3.5m/s ଶ 7. question E14 page 36 a : V=V +at = 2.0m/s+1.2m/s 2 x 2s=4.4m/s b: d= V t+ ଵ ଶ at 2 = 2m/s x 2s + ଵ ଶ x 1.2m/s 2 x 4 s 2 = 6.4m 8. question E16 page 36 a : V=V +at = 4.0m/s+(-1.5)m/s 2 x 2s=1m/s b: d= V t+ ଵ ଶ at 2 = 4m/s x 2s + ଵ ଶ x ( -1.5m/s 2 ) x 4 s 2 = 5m 9. question E17 page 36 Time = ଵ଴଴୫ ଵଵ୫/ୱ ൌ 9.09s 10. question SP4 parts a and b (NOT c) page 36 a. V=V +at t = VିV బ ୟ ൌ (24m/s – 14m/s) ൊ 2m/s 2 =5s b. d= V t+ ଵ ଶ at 2 = 14m/s x 5s + ଵ ଶ x 2.0m/ s 2 x 25 s 2 =95m...
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