A 4.0 kg box has an acceleration of 2.2 m/s2 when it is pulled by a horizontal force across a surface with
μk = 0.50.Find the work done over a distance of 22 cm by the following forces. (Enter your answers in joules.)
(a)the horizontal force(J)
(b)the frictional force(J)
(c)the net work (J)
(d)What is the change in kinetic energy of the box?

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

the force on the thing and the distance the force moves the thing

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