Hai ô tô khởi hành cùng lúc từ A, B cách nhau 20 km chuyển động theo hướng từ A đến B vs vận tốc lần lượt là 60km/h và 40km/h a, sau bao lâu 2 xe gặp nhau, vị trí gặp nhau cách A, b bao nhiêu km?

b, sau 30 phút kể từ khi xuất phát hai xe cách nhau bao nhiêu km?

GIÚP MIK VS LÍ LỚP 8

A200-n force is applied to the foot-operated air pump. the return spring s exerts a 2.6-n·m moment on member oba for this position. determine the corresponding compression force c in the cylinder bd. if the diameter of the piston in the cylinder is 40 mm, estimate the air pressure generated for these conditions. state any assumptions. enter a positive number for the compression force c.

Atypical jetliner lands at a speed of 146 mi/h and decelerates at the rate of (10.4 mi/h)/s. if the jetliner travels at a constant speed of 146 mi/h for 1.5 s after landing before applying the brakes, what is the total displacement of the jetliner between touchdown on the runway and coming to rest?

During the past 150 years in the united states, how did energy consumption compare to population growth