Displacement of an object is given by; X(t)=((9t3+3t2))i+(12t3+7t2)j) m. The x-component of the instantaneous velocity at t=2 sec is m/s.

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

truck y has a greater velocity than truck x.