helene4717 helene4717

31-10-2017
Physics

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Starting from rest, a ball of mass 2 kg experiences a constant force of 8 n. what is the final kinetic energy (in j) of the ball after it has traveled a distance of 8 m?

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banezza banezza

31-10-2017

F= ma so... a=F/m=
8N÷2kg=4m/s/s

THEN
vf²=vi²+2ad
vf²=0²+(2)(4)(18) = 144
vf²=√144
vf=12

THEN

KE = 1/2mv²
KE= (.5)(2)(12²)
KE = 144

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