A boy is running with a kinetic energy of 810 J. If the boy has a mass of 80 kg, what is his speed?A.10.1 m/sB.3.2 m/sC.4.5 m/sD.6.2 m/s
Question
A boy is running with a kinetic energy of 810 J. If the boy has a mass of 80 kg, what is his speed?A.10.1 m/sB.3.2 m/sC.4.5 m/sD.6.2 m/s
Solution
The kinetic energy (KE) of an object can be calculated using the formula:
KE = 1/2 * m * v^2
where m is the mass of the object and v is its velocity (or speed).
We can rearrange this formula to solve for v:
v = sqrt((2*KE)/m)
Substituting the given values:
v = sqrt((2*810 J)/80 kg)
v = sqrt(20.25)
v = 4.5 m/s
So, the correct answer is C.4.5 m/s.
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