choiboiqg2187
17.11.2019 •
Physics
Position of a moving body?
15. a car travels a certain distance with a speed of 50 km.p.h. and retums with a
speed of 40 km.p.h. calculate the average speed for the whole journey. (hint
suppose that the certain distance travelled by the car with a speed of 50 km/h
is x so that he total distance travelled becomes x + x = 2x)
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Ответ:
44.4 kmp.h
Explanation:
Take car is going x distance with . And will come back same distance x There for, time taken to going can be taken as t1
t1 = Distance / Speed
t1 = x / 50 h
time taken to come back can be taken as = t2
t2 = Distance / Speed
t2= x/ 40 h
Average speed = Total distance travel by the car / total time
= 2x / ( x/50 + x/40 )
= 2 × 50×40 / (90)
= 44.4 kmp.h
Ответ:
Explanation:
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