Question

in order to qualify for the finals in a racing event, a race car must achieve an average speed of 278 km/h on a track with a total length of 1410 m. of a particular car covers the first half of the track at an average speed of 210 km/h, what minimum average speed must it have in the second half of the event in order to qualify?

Answer 1

The minimum average speed it must have in the second half of the event in order to qualify is 414.7 km/h.

What is average speed?

The average speed of an object is the ratio of total distance traveled by the object to the total time of motion of the object.

Total time taken by the car during the entire race

time = distance/average speed

time = (1.41 km) / (278 km/h)

time = 0.0051 hr

The car travels the first half of the race, d (¹/₂ x 1410 m) at 210 km/h;

d = 705 m = 0.705 km

t1 = 0.705/210

t1 = 0.0034 hr

time for the second half

t2 = 0.0051 - 0.0034 hr

t2 = 0.0017 hr

minimum average speed of the second half

v = d/t

v = 0.705 km / 0.0017 hr

v = 414.7 km/hr

Thus, the minimum average speed it must have in the second half of the event in order to qualify is 414.7 km/h.

Learn more about average speed here: brainly.com/question/4931057

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