6. A dog can run briefly with a velocity of 12.0 m/s. Suppose a cheetah with a mass of 15 kg runs at this speed. What is the dog's kinetic energy?

1080J

Explanation:

Given parameters:

Velocity of cheetah  = 12m/s

Mass of the dog  = 15kg

Unknown:

Kinetic energy  = ?

Solution:

The kinetic energy of a body is the energy due to the motion of the body.

It is mathematically given as;

     K.E  = m v²  

Now, insert the parameters and solve;

  K.E  =   x 15 x 12²   = 1080J

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).