Question

a dog of mass 16 kg is running at a constant speed of 12 m/s. calculate the kinetic energy of the dog.

Answer 1

If we consider m as mass of dog and velocity or speed is v, then kinetic energy is:

= ½ m v²

We have m = 16 kg

And v = 12 m/s

Kinetic energy = ½ m v²

  = ½ X 16 X 12²

  = 8 X 144

  = 1152 J

The kinetic energy of the dog is 1152 joules.

Answer 2

AnswEr:

Given,

• Mass = 16 kg
• V , Final Velocity = 12 m/s

$\bold{\large{\boxed{\tt{\green{K.E=\frac{1}{2}mv^2}}}}}$

$\tt \: \frac{1}{ \cancel2} \times \cancel16 \times 12 \times 12 \\ \\ \tt \: = 1152 \: joule$

Therefore, kinetic energy of the dog will be 1152 Joule.

__________________________

Kinetic energy :

The energy of a body due to its is called kinetic energy.

$\rightarrow$ Kinetic energy is directly proportional to mass and square of velocity .

• If an object of mass 'm' moving with uniform velocity 'u' it is displaced through a distance 's'. Constant force 'f' acting on it in the direction of displacement. It's velocity changes from u to v.