Question

A man runs with a kinetic energy of 550.8 J. if he has a mass of 85 kg, what is his speed?

Answer 1

A. 3.6 m/s - apex
I hope this helps

Answer 2

Answer:

$3.6\frac{m}{s}$

Explanation:

In physics, the kinetic energy of a body is that energy it possesses due to its movement and is defined by the expression

$E_{k} =\frac{m*v^{2} }{2}$

where E_{k}  is the kinetic energy, m is the mass of the object and v is  its speed.

also  $1J=kg*\frac{m^{2} }{s^{2} }$

Now we have to replace the known values ​​and isolate the the speed(v)

$550.8J=\frac{58kg *v^{2} }{2} \\2*550.8=58kg*v^{2} \\\\v^{2} =\frac{1101.6 J}{58 kg}$

$v=\sqrt{12.96 \frac{m^{2} }{s^{2} } } \\v=3.6 \frac{m}{s}$

Have a great day.