V_av = 1/2 (VO + V); Delta X = XO + vot + 1/2 a t^2; V = V_o - gt; t_max = V_o/g
ID: 1537098 • Letter: V
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V_av = 1/2 (VO + V); Delta X = XO + vot + 1/2 a t^2; V = V_o - gt; t_max = V_o/g a = (V - V_o)/t X = V_av. T; 1 in = 2.54 cm, 1 ft = 0.3048 m A police patrol follows an observes a man driving at a steady 45 m/s for 35s. Next the man drives at 50 m/s for 25 s. He stops for 33 seconds to refuel. When he begins his journey he drives at 38 m/s for 55. At this point the police stops following the motorist. Calculate the average speed of the motorist during the entire period. A space shuttle travels at a speed of 6.8 times 10^3 m/s in a time of 110 ms how many football fields (length 91 4 m) does the shuttle cover n that time? A couple walks 3 5 km in a direction due East. They then walk another 2 5 km in a direction due North. Calculate the value of their displacement A car is initially moving at 35 m/s several seconds later its speed increased to 47 m/s, if the acceleration responsible for the increased speed is 3.8 m/s^2 calculate the time interval betweenExplanation / Answer
1) Average speed = total distanc e/ total time= ( 45 x 35 +50 x 25 + 38x 55) /(35 + 25+ 33 + 55) = ( 1575 + 1250 + 2090) / ( 148 ) = 33.209 m/s apprx
b) distanc e= 6.8 x 10^3x 110 x 10^-3=748 m apprx
no of shuttles= 8.18 = 8.2
c) dispalcement = sqroot ( 3.5^2 + 2.5^2)= sqroot ( 12. 25 + 6.25 ) = 4.3 km apprx
d)t = ( v-u)/a= ( 47-35)/3.8 = 3.16 seconds apprx
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