Một vật chuyển động có phương trình chuyển động x = 5 - 12t + 2t2 (x(m), t(s)). Vận tốc của vật

tại thời điểm t = 2,5s là

an energy transformation flow diagram is shown

where is it ?

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)