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If a sprinter has a mass of 80 kg and a kinetic energy of 3000 what is the speed?
Wiki User
∙ 14y ago
Although the units of the kinetic energy aren't given, we have to assume that the "3,000"
are joules ... the SI unit of energy; otherwise we can't go anywhere at all with this question.
K.E. = 1/2 m V2 = 3,000 joules
m V2 = 6,000
80 V2 = 6,000
V2 = 6,000/80 = 75
V = sqrt(75) = 8.66 meters per second (rounded)
Wiki User
∙ 14y ago
Wiki User
∙ 9y agoThe kinetic energy of any moving object is 1/2(mass)x(speed squared).
The kinetic energy of an 80 kg jogger running at 4 m/s is 1/2(80)(16) = 640 joules.
Zero Spartan
Wiki User
∙ 14y agom= 80kg
Ek=4000j
V=?
Ek=1/2mv2
4000=1/2x80xV2
V2= 4000/1/2x80
V2= 4000/40
V2= 100ms-1
The speed of the sprinter is 100ms-1
Anonymous
640J
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