stevesunishchiramel stevesunishchiramel

06-08-2019
Physics

contestada

John runs for 10 mins at a uniform speed 9kn/h. At what speed should he run for the next 20mins so that theaverage speed comes to 12km/h.

Respuesta :

MathPhys MathPhys

06-08-2019

Answer:

13.5 km/h

Explanation:

John runs for 10 min at 9 km/h, then 20 min at v. He will have run a total of 30 min at 12 km/h.

Therefore:

(30 min) (12 km/h) = (10 min) (9 km/h) + (20 min) v

v = 13.5 km/h

Answer Link

Otras preguntas

Solve for x 2(x+5)-7=3(x-2)

What is 3/4 divided by 2 equal

Find the value of x that will make A||B

Find the length of the hypotenuse.

A certain type of laser emits light that has a frequency of 4.9 x 1014 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.

Sexton, Corp., has projected the following sales for the coming year: Q1 Q2 Q3 Q4 Sales $ 860 $ 940 $ 900 $ 1,000 Sales in the year following this one are proje

What is the relationship between the movie matrix and the Bible

Cuál de las siguientes estructuras no es propia de la célula animal * a. Ribosoma b. Centriolos c. cloroplasto d. Golgisoma

*EXTRA POINTS* what should be done with the two forces to find the net force? 29 N→⬛ 48N ← *

how do you think can christ dwell in you?