An object with a mass of #15 kg# is moving at #4 m/s# over a surface with a kinetic friction coefficient of #2#. How much power will it take to accelerate the object at #3 m/s^2?#

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Answer 1 · 2017-06-01T08:23:25

The power is #=1356J#

The normal reaction is #N=mg=15gN#

The frictional force

#F_r=mu_k.N#

#F_r=2*15g N#

Let the force necessary to accelerate the object be #F#

Then,

#F=F_r+m*a#

#=30g+15*3#

#=339N#

The power is

#P=Fv#

#=339*4#

#=1356W#