Question

A 10 Kg dog is running with a speed of 5.0 m/s what is the minimum work required to stop the dog

Answer 1

Answer:

25J

Explanation:

Given parameters:

Mass of the dog  = 10kg

Speed of the dog  = 5m/s

Unknown:

The minimum energy required to stop the dog  = ?

Solution:

The dog is moving with a kinetic energy and to stop the dog, an equal amount of kinetic energy generated must be applied to the dog.

 To find the kinetic energy;

        K.E  = $\frac{1}{2}$ m v²

m is the mass

v is the velocity

Now insert the parameters and solve;

      K.E  =  $\frac{1}{2}$  x 10 x 5  = 25J