An object with a mass of #4 kg# is moving at #7 m/s# over a surface with a kinetic friction coefficient of #3 #. How much power will it take to accelerate the object at #4 m/s^2?

1 Answer
Deepak Pandey
Sep 9, 2017

#952 #watt

Explanation:

As the object is moving hence force due to friction on it is #f=mu_kN=mu_kmg#
#:. f=3×4×10=120N#
Now additional force needed to be applied to achieve desired acceleration #=ma=4×4=16N#
Hence total force needed to be applied #=120+16=136N#
Now power #P=F.v=136×7=952W#

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