Question

What is the Kinetic energy of a 645 N woman jogging at 0.72 m/s squared

Answer 1

Kinetic energy of an object is given by

$KE = \frac{1}{2}mv^2$

here we know that

Weight of the woman is 645 N

so we will have

$W = mg = 645 N$

$m (9.8) = 645$

now we will have

$m = 65.8 kg$

also we know the speed of the woman as

$v = 0.72 m/s$

so the kinetic energy of the woman is given as

$KE = \frac{1}{2}mv^2$

$KE = \frac{1}{2}(65.8)(0.72^2)$

$KE = 17.1 J$

so kinetic energy will be 17.1 J