Một chất điểm chuyển động trên trục Ox với phương trình chuyển động là: x = t2 - 10t + 5. Trong đó x tính bằng mét, t tính bằng giây. Vận tốc chất điểm lúc t = 3 s là

for this one it would be d bump/forearm pass

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 skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

answera compound;