Question

If a 1600-kg vehicle travels at 10 m/s (or approximately 22 mph), then find its kinetic energy in kilojoules (kj).

Answer 1

The kinetic energy of a moving body is given by,

`K =(1)/(2) m v^2`

Here, m is mass of the body, v is its velocity.

Given, m= 1600-kg and v = 10 m/s.

Substituting these values in above equation, we get

`K = (1)/(2) (1600 \ kg ) (10 \ m/s)^2 = 80000 \ J`

In kilojoules,

`K = 80000 \ J = 80 * 10^3 \ J = 80 \ kJ`

Thus, the kinetic energy of vehicle is
`80 \ kJ`