elawnnalewis3568
11.07.2019 •
Physics
You jog at 9.5 km/h for 7.0 km , then you jump into a car and drive an additional 18 km. with what average speed must you drive your car if your average speed for the entire 25 km is to be 22 km/h?
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Ответ:
Average speed of car is 45 .
Explanation:
Average speed for entire 25 km is 22
Average speed =
22 =
Total time =
Total time = 1.136 hour
Time for first 7 km is given by t,
t =
t =
t = 0.736 hour
Thus, time required for next 18 km is
T = Total time - t
T = 1.136 - 0.736
T = 0.4 hour
Hence, average speed of car for 18 km is given by,
Average speed, v =
v = 45
Average speed of car is 45 .
Ответ:
my dog ate all of those papers over the weekend.