Question

22) A driver traveling at 80 km/h brakes her 2000 kg truck to stop for a red light. How much internal energy is produced

Answer 1

`E=4.9* 10^5\ J`

Step-by-step explanation:

Given that,

The speed of a driver, v = 80 km/h = 22.22 m/s

The mass of the truck, m = 2000 kg

We need to find how much internal energy is produced. The internal energy produced by a truck is its kinetic energy and it is given by :

`E=(1)/(2)mv^2\\\\E=(1)/(2)\cdot22.22^(2)\cdot2000\\\\E=493728.4\ J`

or

`E=4.9* 10^5\ J`

So,
`4.9* 10^5\ J` of internal energy is produced.