An object with a mass of 12 kg is moving at 9 m/s over a surface with a kinetic friction coefficient of 1 . How much power will it take to accelerate the object at #3 m/s^2?

1 Answer
Nov 22, 2017

The power is =1274.4W

Explanation:

The mass of the object is m=12kg

The speed is u=9ms^-1

The acceleration is a=2ms^-2

The coefficient of kinetic friction is

mu_k=F_r/N=1

The normal force is N=12gN

The force necessary to accelerate the object is FN

According to Newton's Second Law

F-F_r=ma

F=ma+F_r=((12xx2)+(1xx12g))N=141.6N

The power is

P=Fxxv=141.6*9=1274.4W