How much power is needed to accelerate an object with a mass of #5 kg# and a velocity of #3 m/s# at a rate of #12 m/s^2#?

1 Answer
P dilip_k
May 6, 2016

#90W#

Explanation:

Mass of the object #m=5kg#
Initial velocity of the object #u=0#

Acceleratlon of the object #a=12ms^-2#

Final velocity of the object #v=3m/s#
If final velocity is gained ints then
#3=0+12*t=>t=1/4s#
Work done by the force W=
KE gained by the object
#1/2*m*v^2=1/2*5*3^2=22.5J#

Power needed #P=W/t=22.5*4J/s=90W#

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