Question

natasha weighs 530 n what is her kendrick energy as she swims at a constant speed covering a distance of 72 m in 1.0 min

Answer 1

Given,

The weight of Natasha, W=530 N

The distance covered by Natasha, d=72 m

The time in which she covers the given distance, t=1 min= 60 s

The mass of Natasha is given by,

`m=(W)/(g)`

Where g is the acceleration due to gravity.

On substituting the known values,

`\begin{gathered} m=(530)/(9.8) \\ =54.08\text{ kg} \end{gathered}`

The speed of Natasha is given by,

`v=(d)/(t)`

On substituting the known values,

`\begin{gathered} v=(72)/(60) \\ 1.2\text{ m/s} \end{gathered}`

The kinetic energy of a body is the energy possessed by the motion of the body.

And the kinetic energy of Natasha is given by,

`E=(1)/(2)mv^2`

On substituting the known values,

`\begin{gathered} E=(1)/(2)*54.08*1.2^2 \\ =38.94\text{ J} \end{gathered}`

Thus the kinetic energy of Natasha is 38.94 J