A 2.7-kg box is released on a horizontal surface with an initial speed of 2.9 m/s.It moves on the surface with a deceleration of 0.27 m/s^2.Calculate the kinetic friction force on the box

Answer 1

The friction force equals
(deceleration rate)*(mass)
= 0.27*2.7 = 0.729 Newtons

The initial speed does not matter

Answer 2

find the equivalent capacitance of a 4.20μF capacitor and an 8.50μF capacitor when they are connected\